Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f40565e5d5d2aa8…

MALICIOUS

PDF

171.2 KB Created: 2021-07-21 08:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b5226e555df1a3c51418e54d02faac5 SHA-1: 596cb0dbeba7782a2871b582215e58f437fdf702 SHA-256: 9f40565e5d5d2aa8ee38916a592763f997cdb06dda1686965a9972493804a99f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9707

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077ade2ca795---77143844611.pdf In PDF document text
    • http://agcslohian.com/userfiles/file/rojagobalenenesevuwutule.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a42af59be9aaf6db1f5489d7def2b79/bekox.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c08faa7304f---94819081535.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/o19njiuda6esvv0pp09l6jsad5/50539799624.pdfIn PDF document text
    • http://daydala.com/userfiles/file/kikek.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/xidivodebukejijovuxesifa.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/kowofujonojuwasulegiko.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/mubewabuxo.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1e05aa7854e6532adb4ba51876d6e0f/kedigudutateke.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/67103808435.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9b6a9749fef979c1d9fcafaf202cb4de/kugagiti.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/98232249936.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/0c841efdf40ddec82eeebb2e63b0fa57/niliduruxesuwejozo.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/26444932268.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080959eb823d---faxavirevezagubebi.pdfIn PDF document text
    • http://suaups.net/userfiles/file/bukijuxezemufubasosi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/zojeviziguxinudidobuleva.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/11633324121.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a290162c97---fuzoxasifabinanonevu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd2e25d1e0---ralitufelu.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/wulidusiwifapuba.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c1c7dc66---nufododuxijere.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/livoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=architecture+of+fear+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002443a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2443A 3056 bytes
SHA-256: d5e7c9a49541b405998090b4d7426a8ffe3dcb32501bfec17b24fca5d28ab13d
font_02_sfnt_off00025094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25094 10480 bytes
SHA-256: 4c9ae6166a0b7a301f3cad1b2a1b61211e769c46cfb87e75e6bb866b6e701540
font_03_sfnt_off00026887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26887 21576 bytes
SHA-256: 824960515af2a606daff375c4a97d7fabf29cc44096a922677f1f01c01ca6c44

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