Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14f790ad927b453…

MALICIOUS

PDF

104.6 KB Created: 2021-07-08 04:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3f9cca5452937a97f86f0ecbc229a269 SHA-1: d75fa8b9790d51f8eacd831af9521d27be2884df SHA-256: c14f790ad927b453b7106ef8acfe6ee31d6b0619a3763dc4fcbff8640984d41b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of callback phishing or tech-support scams. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mauspro.net/upload/files/91836220176.pdf In PDF document text
    • http://jwnorthclassof70reunion.com/clients/c/c6/c6167e942b76adab5863fbee8ae727a7/File/nabusejinatobagunuvadum.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/widugamo.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd3ffaa738---ketoloximalelopotum.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ffd498ed28002846fa8a7b39f6c610d2/pamajirefefitejiw.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/80331057354.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092573777ce8---20552586017.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/70357074420.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/28717241865.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/75626725669.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/69654805704.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096b37c77068---27392371329.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b07a1b67d33---xosakogurakupemasawute.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/lagegumek.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/51133702893.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a32bb187---jotimajunugovudefu.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/taxofumotes.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3f9f3b6b---takisuxig.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adec1463024---fubefapeses.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/670974b7979bc37303a46216d4f77961/kuxul.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/g540egv9dperfqi04tj9t16ruh/8681773994.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2e251416e---razekaxane.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079ce2643b35---getuwuwasobusiw.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7595ed7d0d912902d80642e87f8a5c1d/55631521316.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/sqshj6ri02ta0t18iemem84mvs/24275804628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mechanics+of+materials+gere+8th+edition+solution+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 16904 bytes
SHA-256: db8f0e91ca92cb8e7665ded0c4392b3a647cf5819bf67f2ffa322693e7e621bd
font_01_sfnt_off0001312f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14946 11224 bytes
SHA-256: 3649a5a3ce9a60810dfe1b523d71d58ef70045493d5755626c555b7312e798a0
font_03_sfnt_off0001632f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1632F 18868 bytes
SHA-256: 9c9cb3bc502000eb8509e4ee67bec578e7e723c1e3d8c3c0b4e6879f52220dfd

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