Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f039c1496bf1e21…

MALICIOUS

PDF

78.0 KB Created: 2021-06-27 23:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 815453458a4b9c49da1bc99ee28be96e SHA-1: 067fe0336a44663623883b1a1e83d1752d2feac2 SHA-256: 1f039c1496bf1e2187574c06f6604db75c2379f555b2f04be5011703365f05dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external links and the 'urgency lure' heuristic suggest the document is designed to trick the user into navigating to a malicious site, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://allytemp.ru/uplcv?utm_term=node+js+in+action+2nd+edition+pdf PDF link annotation
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/204e0956997cadca439f4c81abe8f31d/88775253117.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wezigipudubuziwuwadul.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a306322c5---besufomawodaxoxorujeruwo.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/66770233493.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd807e8fcd3---wapudatomaneginejotiv.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/8fe012abf0aea864a85f8d23b5926a8a/xamunufama.pdfIn PDF document text
    • https://mmszke.hu/files/file/surumuwedowepuv.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/klhintddrc2e39mk0ml9difhc7/56749229213.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/tufasalavewekimexuti.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608099c968ded---69364718506.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b86qeangma72e6ta66emej07g3/bobonij.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/putagumasuzeboxen.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/t243r04hdn3dckn49kv1l11kr2/wepos.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/58572378885.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/1p014ildoq9ve17limflkk1lcb/zalij.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/40705687733.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/974a10300e6f6dd714a111974a4a7db6/juxutoged.pdfIn PDF document text
    • https://aashianarealty.com/file/34266476801.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/44ce6cb45417af1cfa90bd4d68ce6e4c/legigawil.pdfIn PDF document text
    • http://4bx.pl/public/file/31733161727.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/f8c6853e119348d8f54ec818f62dd90e/13443692882.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff81b3043---fofuzatituz.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/8853f67f460db5fe53f3870f492dc477/90163657071.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/delapitulixasepuzawor.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/tigeniwa.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD057 10696 bytes
SHA-256: a617a817316e48443f1fb1cc560a487180bca6d38713e758776ebede905b7a76
font_01_sfnt_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 16048 bytes
SHA-256: 0a24873e1aa9b9e6b1d0689193194ce6c32a847fd1c59cb739cecec7c64f2a32

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