Malicious PDF — malware analysis report

Static analysis result for SHA-256 400c0454b4c8bc55…

MALICIOUS

PDF

111.5 KB Created: 2021-07-02 08:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e80fdfa9ebcb00557f9957b2b8708e88 SHA-1: ce607b76ded7a8a33eba5d9fa8df6d690034651c SHA-256: 400c0454b4c8bc5568e7eb8bd1715026292a8dea3995c473da225f94ce5a4b03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous external URIs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of external links and the overall structure strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9836

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=hobbits+from+the+hobbit PDF link annotation
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a23f551acfb---repovugoxiwatovi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f099c266a6---1353557468.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/67530129613.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/1f69458a3d4cc840965b904568fa7c91/70048796482.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/81701400878.pdfIn PDF document text
    • http://www.bandungmesin.com/file/95105642246.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0aec4c6e1---nazajekesudewajojawikuwo.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/17457003627.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/rogefibopexuvad.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/35911589014.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086053ccf4ce---xigupokitonosafi.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021052523485624.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/92796594459.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6584b1b9c---74132833355.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c854cfb545d---dapidaz.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/xerajawozilapejitinote.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b7f8c373f---31564393415.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa42fe6642---375445776.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/qv8se9cgatki3h6jouvgqth2bt/80143274086.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/9865663732.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CC 3180 bytes
SHA-256: b778bf14c2705e2c59d9b9ab2bb87cd324c7d9d4e19e75d2ac8847837dee72bd
font_01_sfnt_off000125b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 10296 bytes
SHA-256: eadc9dc48d4e2cab4e4a2697d67000bdd7d5255e8633f1637b5b37eae6b5e2be
font_02_sfnt_off00013ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE1 24304 bytes
SHA-256: 59061b28f6b054c1bb190d3f55cdb485bb719585bbc686219813101b772472f1
font_03_sfnt_off00017a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001927f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1927F 18492 bytes
SHA-256: 7f01e71582cd1a43d08c7d67e6bd548b9376a25222b4764834f8b3188b7bca3e

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