Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc1f68d9cfa5fb3…

MALICIOUS

PDF

73.9 KB Created: 2021-05-25 11:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29e5040eea8a1a45593484827c28da5d SHA-1: 13cf1dc388a99f33629b897b4265bd52d0b6fec6 SHA-256: cbc1f68d9cfa5fb35129f09a01fd99412acde2014db648d430dd7bd04e8d5539
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The presence of the 'Filmora for windows 7 32 bit' lure in the document body, combined with the high ML score and ClamAV detection, indicates a phishing attempt designed to trick users into downloading a malicious payload. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign.

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://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/fa70deaccdb57ca42809a1c01dc5905e/bobivozekubuzelajeluzop.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/vnmteea91jdo6bcncjmr2fmvd4/23332083271.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8a4adf15fc498124bfe3def237abf21b/49299705439.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1aba6078e---28563613664.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/2ce3afff43656ad74d7b5fa4d2a9e817/zujim.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160755cd60434c---dazorabogagilezedavi.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086932c3e591---12894143372.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffef484f80---84697369124.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817fda8c233---8922420187.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/93be2382612f74b2afb0720c17d6210f/jegogisudezalariso.pdf
    • http://cedule-plachty.cz/files/file/7780038710.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e0d610d91---19244740566.pdf
    • https://pharma-tools.eu/galeria/file/50880484631.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/28ab50a3329c991bc0e4f359ddb2c49f/13976946987.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/06r909fdlookori0onrg5fjfnk/kaxamubebixixugatojaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=filmora+for+windows+7+32+bit
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e39c7c9a8bb5195009d7ab97d0cec9ce/50289470692.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e283.bin
cae346ab141ab8c8fc08bb96207361428c27666d34610439acc93094a4b4d8c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE283 5616 bytes
font_01_sfnt_off0000f5a2.bin
4202845509abfe72d45094fae7f1c4fb5c2d7fea648b1685539c4f91f99c40d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 10320 bytes