Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2276023c225c438…

MALICIOUS

PDF

77.3 KB Created: 2021-09-13 21:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4ec804f8d0d26fec36bf121b9ebbd2d SHA-1: 5405346feecd1205a47d8263a6f058836e3398ec SHA-256: f2276023c225c438dc79f1144d7a4b002c93fab4e2e01381ba4a0b807b8046fb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number for issues like billing or refunds. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content or facilitate social engineering attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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) 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 http://joyandwowbook.com/upload/file/japusonazapipisari.pdf In PDF document text
    • http://shortguycentral.com/ck_uploads/files/74725429578.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f91af498---funebizok.pdfIn PDF document text
    • http://shopabrang.com/images/files/63511644781.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613f986108311---widanepotiwite.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cc8276c4a---98536877741.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/20759930805.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/kakabalemawapenulu.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/30741591314.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/79400155625.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/tusakutuxunepuvi.pdfIn PDF document text
    • https://emmaushuis.org/pages/gumikuli.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/sujapefurebi.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/tiferije.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/fesejugizigasow.pdfIn PDF document text
    • http://metzlerranch.com/userimages/31638039749.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/xapegavonuwarevude.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/2a595af377775f5432453823cfa67a14/milonilolonuboxuluf.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138279366611---gozimuwexagaloxemojar.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/buletelipufuzumagukeg.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9c82c4b04---25212823788.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/17214986428.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d6b6698b---63930587643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tutuapp+2020+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA3 16840 bytes
SHA-256: 8f6b089a6560a1aa226c19feaa8dccf2760594e92a491647593cd1d9f7d6f538
font_01_sfnt_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EA 9880 bytes
SHA-256: 58be668861b7574f8210fd32230fdae196d7f3f0924e596e55e9171c43a0870c

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