Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4ac945f105019b…

MALICIOUS

PDF

71.4 KB Created: 2021-06-29 17:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9e4c901220dfdc9e617ad632b53c0977 SHA-1: 247c1e7ce56f35dcdb52a5be459954a8cc6294c3 SHA-256: 1f4ac945f105019b5cc9aa2a93a2bbd9aceca4cda41af3520f6e3e6647a4b40d
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 it is likely a phishing or trojan distribution attempt. The file contains numerous embedded URLs, many pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to lure users to malicious content. No scripts were extracted from this sample, but the heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=realistic+pro+2028+scanner+manual PDF link annotation
    • http://chingyi.tw/userfiles/files/91288994664.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0ad47ada7---gorupuw.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086c424e8be2---39535100284.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202162112517546.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bcd59490d---62141042146.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/33893309613.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/qpjadv675bls2g843fjh5j9i61/75137126936.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4mgs3kq5fd4th6bqjp1vsuf0bh/lelitarogutem.pdfIn PDF document text
    • http://apcmagon.com/userfiles/fezezad.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/lipomajoxejujeso.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/hh7kope3p9mto40mon4miu79r6/63040065336.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab93c21e925---32321830307.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/xaxelaf.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/1d913c1d62923e318eaf7db0709092c6/82755355865.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e983c7f12d---42334235142.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96fbc9d3836eb26ee6080271643a8a5f/69721280999.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/81611325205.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/vajakixoderonabipa.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/c322d859550051be27b4b2574b4564d0/kenuviwuviv.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021642355434073.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/08528b6ad7ba87fbf2eaf06994fc1017/kudefobotakunakepowaz.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/k7j4rr9e13grmmgp45ntie4pnt/pitikupola.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/34100858668.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/43a0aabb1fe1a7cebd19b64ca5d13645/76752064631.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/5d402f593dc94a7b274e3d6b48d0cf2d/15418476010.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_off0000b7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D6 11128 bytes
SHA-256: 32f14e64f0ce5d28a466a6be9e324f01e7c4536df6986dd28ac4a7aba56c4500
font_01_sfnt_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E7 15060 bytes
SHA-256: c3ea52f6387ce853d2de5963d3881644f534622441c678bf8ebcd4e6d76dabe7

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