Malicious PDF — malware analysis report

Static analysis result for SHA-256 241a3fd025b36496…

MALICIOUS

PDF

85.3 KB Created: 2021-08-23 11:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 589eec0edb6fd874011db1c835b69554 SHA-1: f1bba5dc276ba8471fd8260b13ef6b2c4fb6c898 SHA-256: 241a3fd025b364960a1baf4c5e651df72d3f39afd7de940e0a64f9ad289b4bc8
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or are hosted on disposable domains, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The 'Urgency Lure' heuristic, while low-signal on its own, supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://aisef.org/uploads/userfiles/file/file/74049243391.pdf In PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/10014610292.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/tarakutirax.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/xabunizaxuv.pdfIn PDF document text
    • https://wsbtitan.com/images/file/livutejemuruzasideganobo.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d61c82dbc9e---47888477883.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e6c2b768b8ef53ffafe9e7ac91f95de8/kuminugerukuraxofanoto.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/xebudogadanovurot.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076895219163---nafos.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/sitizujibekenojududutu.pdfIn PDF document text
    • https://777mto.com/contents//files/kufagitirasibifejefid.pdfIn PDF document text
    • http://dzbnf.com/upload/file///dabumasirivafazumused.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/93c7326a2d0dfad972e96ea1729a231f/divomu.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/xegugezoz.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/xabulenazudazi.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/44593e8153fd22b0d93d2fa46aebd050/sevonojamokewovepa.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/5fff97c52fd1ee1772f13dc462b19321/sikosixegunazodavodi.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/6e24598fbd1a21cf855bc5f4687fbd63/morux.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e1175d2b081b7efcbffcf5577a16681c/jigoxumalevi.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e572ad6e44---bigug.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/nejalonutepaxituv.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715f1fb5114---veraderovopetizon.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/58211426961.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ad9devg24h0qqlns7d8jkv1qor/79124822018.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a940266efd0---vekujafugizuvasixeseg.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/nujoxodexo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088ef029fe73---fofazawotobuguvu.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/vawezusenesiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=laxmikant+polity+6th+edition+pdf+in+englishPDF 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_off0000e7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F1 11276 bytes
SHA-256: 44322ccaa0253e7afb12b8746c0d281de3695bf530b3c0d7961c7d39d568ed7a
font_01_sfnt_off0001020d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 16808 bytes
SHA-256: fc47319760ef1ff840a6b98e1afc4c224a57700d6577ca54d4e5d90454c64c5d
font_02_sfnt_off00012dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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