Malicious PDF — malware analysis report

Static analysis result for SHA-256 04af07b6d91f4c6a…

MALICIOUS

PDF

126.6 KB Created: 2021-06-27 15:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 163c1a6533b29259d314c826d5ff363a SHA-1: 91c1806f5cdb48e7e4f97ef5521075bd83fec911 SHA-256: 04af07b6d91f4c6a4899746e54ff5a1981c78eeece5ce7f4824ecaeea9aa5a68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely to lure users to malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://medvor.ru/uplcv?utm_term=hplc+empower+software+manual PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2o13kai35m2tlpg5mh1gvf3ee0/xumidaletupetewekukadupan.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/sagobote.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/49412549048.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/088b86971581a8207d7d794fe7809142/fonakokol.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a63564b44---15602916499.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/7065aa78f668185b8ed83f64496625c0/49766922012.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/japovonozesupupumunutaliw.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29efa27b2273191d3bb76caf3737c673/81839881218.pdfIn PDF document text
    • https://parkettworld.com/upload/files/55859121552.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/a9oamcd7aoalgf0mncc0u9nlbo/12078241494.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4194c1c73c---sekugikalafiguzemebowone.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/d446ca17b3fe2ae62c442f07d4c4ae17/65422155215.pdfIn PDF document text
    • https://ecoretras.com/file/19204466850.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/wobiketotutidukotemaxuxo.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c263ab855e2---78805301.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd26ae09cb---bimifaroj.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/51050589945.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/e6862f9cef1aa49555f973943081ef29/bobav.pdfIn PDF document text
    • http://rosycaffe.com/file/mepomixiwevobofegagudej.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/9a4ca9c2c743417d8236b30a412153ed/lelitimaruxemo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081804ecd337---bupiwekupibarunopafeba.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///zazebomevexanu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4ec75267e---46648763370.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dce044a342---11872123861.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_off000187cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187CD 19992 bytes
SHA-256: 0ce9d1d7449703dc4d3781d3c2142e9f690a7d327bfbff8c52744d837ff553e9
font_01_sfnt_off0001bc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D43D 10724 bytes
SHA-256: 5127fa5a1ac6f132c74ac4e02f11c7a054d4e70eda74255c1f0c4e5ac3007ac7