Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc2acc80f0ed211…

MALICIOUS

PDF

73.9 KB Created: 2021-09-03 16:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f7028a6f36c52b76dd72a7eb52b9a9e0 SHA-1: ab30000bd771e4f67c459932f057208d93ebe07d SHA-256: 6cc2acc80f0ed2112f28bdd41a417500d5200a55618eb86165cc34c207c4950b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites and link farms, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL findings indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=yamaha+fz150+service+manual+free+download PDF link annotation
    • https://lesura.net/userfiles/file/zatodipusujaxesunumo.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7161a6b40---68724343152.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095113b9a183---rijetisirefemufa.pdfIn PDF document text
    • http://famillespourstarlight.org/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/tejeniwalaw.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/kufaledozawopapa.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/jtmaenl59qi7838dk1srs66b0q/bowojumanenenajo.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/99276946443.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/bitopazumurupeja.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/56882563434.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a8140c9adc1---51132228350.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/purobuzokidelili.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/c2af7e46ec6815da624d42bbd8ef26d2/40477638962.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/284830df639ef67ec863c58ef928e7e4/12250004010.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/4tcrfa8ov7epraa9i3k6ghf120/fisafef.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/81d7e9ff903246ff57f0de23cf1355ff/kumijujaxerusom.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d3bf4aba1a0b43f9c2785a788b1e1577/serenezozuve.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0363fff94f8963430a74f89e4371b377/80348667217.pdfIn PDF document text
    • https://andrejc.si/files/file/59190101825.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/nujamesobafilamogugimodo.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/vaxokutapet.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e990761eb---18989368428.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/lnkmcslpj5vakm08g9vl3o7f54/92436163929.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/5jk1ksaea24spv35a4813l4jcs/salumebezog.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/57997605c8411fb871edcd2ff3c4086c/7092250050.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97F 11244 bytes
SHA-256: 3f2f4efb32c25ea37dc0ad82927675c9504a9eaa07bbde84b09a98e28b216155
font_01_sfnt_off0000d3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CB 17804 bytes
SHA-256: 0bfe55e98d4946d8417ac5499fae4f5141c6f46165eeb2e5591f5c36af58056b
font_02_sfnt_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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