Malicious PDF — malware analysis report

Static analysis result for SHA-256 77569e8cadad79a3…

MALICIOUS

PDF

132.0 KB Created: 2021-08-20 17:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d591d9286e38c746a2dda8e2aedd233b SHA-1: ebc261849afba33f67d4fbf06c38996150f7bf21 SHA-256: 77569e8cadad79a39f58291d52cef8a707de6e451d6faf3a6e0d9e05f6fca2b3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress upload directories. These links likely serve to redirect users to malicious payloads or phishing sites, making it a classic example of a malicious document used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/27eca763bd213b729d28d17a8e15c4a3/tosazofunaluvolaloju.pdf In PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160806d6f1b273---38890655615.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/kilobiwewu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b84da4e229dac38b9d156406180c7655/pepetotu.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/hev2ohsc45qq77s3gmbl2nfbkh/sifewit.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/48206498488.pdfIn PDF document text
    • http://meadspool.com/clients/8/8e/8e46726fd42f39913d2349bbdb4e70c4/File/85647353970.pdfIn PDF document text
    • http://dejede.com/userfiles/file/fewowil.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/81106381529.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/rokametuj.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/misulaguganixerebusuji.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/8740213447.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/eo27iuacv2j3nis2oltpa76qnt/62114005088.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/78867983558.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d706a95d863---31907351874.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/svh2026fll6dhajlhdrufuf463/70028499791.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/37704377297.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/xudepex.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gujuzowixepalawemul.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/23779053008.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/30514683216.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/3kri2t35b71ktrqv9lam7pvcvs/83259060586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=newcomb+studio+loom+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A143 10732 bytes
SHA-256: 026e17d68ae03b2d82ed34b3e85c719b737cb1524a61b5f42eb79f172951d1e9
font_01_sfnt_off0001b9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9F5 18088 bytes
SHA-256: 8fbd48028e442a94b951bfd97ea55dbef517f294e547beea348e0c405d436315
font_02_sfnt_off0001ea01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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