Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3646edc2fe0ea1…

MALICIOUS

PDF

84.8 KB Created: 2021-06-12 07:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e427d1a369cb1a50d153168fd54ee14e SHA-1: 92e44bfd17538f55846ef6b83015657c3dc4efaa SHA-256: 6c3646edc2fe0ea1381ace4264bb3780d17d3a536cbd1d245cc79dcc68b5598a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'data analysis and interpretation in research methodology pdf', likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=data+analysis+and+interpretation+in+research+methodology+pdf PDF link annotation
    • http://ceskylakros.cz/userfiles/file/makexoxovavovanasuz.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/19605e29096e49c0f48ea63a22196ac4/86814389262.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b715e2a08---73034878743.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/13034638267.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c0e88ca2b7f5da923a5536acde6abf1d/rupavojupes.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/77160272412.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d39e9f95---rarudoreriw.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084b01ad8e0c---20300049039.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/vp4g03pvha5rhvruohgupc1303/moruwitafifif.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/74839865198.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/eff035f2d976e47c7151d13ff263c508/56965698452.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/reretefezubebixijimomiwez.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/a0856e84fd39534e1efec0e0f13b7ee2/2506805706.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8dc719951ba631bc779f6641667619e6/fubobiwomeruv.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dc307eaa3---42233248049.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000f768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 5672 bytes
SHA-256: 7cd01e018d171bb076e835bd438e144275423fc60c6aa8751310f8267408bacc
font_01_sfnt_off00010a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9D 10752 bytes
SHA-256: 0b076a8f9191799a1a6dbdcd77870957f26cc7230c69c5eab3a55f7b852f259a
font_02_sfnt_off00012fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA5 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e