Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea6ab1f00345a8f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 10:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4208343f494f7b959ed776b114efc98 SHA-1: 9d32b178771f38d12b95db2ce660a31393946ceb SHA-256: aea6ab1f00345a8fea142e634e800a598cab3ebb9b482c8eae689ffc23fec956
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://catamma.ru/uplcv?utm_term=cheat+pokemon+go+walking PDF link annotation
    • https://safetyhanoi.com/userfiles/file/gudogulid.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371a57179c3---nakizur.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/lejebopa.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/58770228862.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/vifazufutajuvorolo.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/68203825069.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/vuvefazanutito.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/mizifosital.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/62686988518.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/76912637890.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/fukuzabosigidexato.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/jazegejikutozed.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/gibuvabe.pdfIn PDF document text
    • https://aneri12.eu/res/file/giwes.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7b39ddc9e01b8eb8893afcdb0c4a9db6/zuwikonevumod.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410ea0c6fbe---66898522375.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/51728976675.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/82127665338.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/sewulewozunilu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161390768e139c---digodupirozigivowofefoza.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/burojijuxezodarevowugiz.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/palumurelifo.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/34112263031.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/6603710439.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/bubupokagitada.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142806f25440---pabixobesajugezovuk.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_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 10640 bytes
SHA-256: 65fea12ef21968316ff4c00591c2165e917c6dc16312ed9049b768ca3f9a874e
font_01_sfnt_off0000f7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 19100 bytes
SHA-256: d05c6cae86a101f04af0035f32416b598dfa92e34d439e3298e485ad117ceac5
font_02_sfnt_off0001294f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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