Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1200b2d38e8dca…

MALICIOUS

PDF

101.5 KB Created: 2021-08-25 03:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae36bb63ade9d07bf5b0c6332542b10d SHA-1: aae94e0777fbd14e16108d23f1e0869678faa087 SHA-256: 1c1200b2d38e8dcaa486268c45a6e8187c3b46101e8e7b52fe85504b73e5b1a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of external URIs and link farm heuristics indicates a clear intent to redirect users to potentially harmful destinations.

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 http://budoprojekt.eu/obrazy/file/linopoderizodana.pdf In PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/93581d773dbe65c73ac36eb9ce9b9d55/26120802807.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gcfebcc6vp77ol55r80aplik97/36362247059.pdfIn PDF document text
    • http://yilip.net/userData/board/file/vupop.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffd71b7a76---relazi.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/eb9e87834ba032fb1f134d31d6c3d3f2/40599973881.pdfIn PDF document text
    • https://anakmeong.com/contents//files/pewopefuperixofixed.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/jedinamuze.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/bgsc83kfiau38rkp7t97dbjd27/78926565109.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/44377427926.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/40371099519.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbabcda3a5---45481958817.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f07411950a562913c6f3a079b2ea4462/57596302548.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/notipave.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/40450855770.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/euo5t2d27tm7lt16u4emfr7hds/sedojav.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/76695862154.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16090dc09c32a5---lafotufakunazojorokiwad.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d92b1ca8d9f---8070870799.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/70561695148.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7932e2af6c---50121070449.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/viladawiladomipowit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=instructions+for+1040+2020PDF 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_off00012c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000144ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AD 10412 bytes
SHA-256: 71af93899d27cc0c0f4671b837b97d54501b476be9186039c4e6e09ff7712c89
font_02_sfnt_off00015c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7F 16580 bytes
SHA-256: c3c5d01b80f4bb06936821fa4a149212505239ff679991f9d3e2ace8fa60b50e

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