Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f36d286015d83c…

MALICIOUS

PDF

83.8 KB Created: 2021-08-16 06:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4abeab881f3d8fb91d2b2cd92eb96e81 SHA-1: 1a83e1fa2ab97651a3900e9a147c18848d599f48 SHA-256: d5f36d286015d83cdac599fabea93b9e6a0c7ba75c7b4ddfb9ce266f58c79f29
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=modelo+de+curriculum+vitae+europeo+para+rellenar+en+word PDF link annotation
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/1c94243ecd048e2611364c6d544bd1b8/barurexubekolofaruxo.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210731_074600.pdfIn PDF document text
    • http://altinay-law.com/images/file/52474679992.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/woxesevusovijedejiwexu.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/jofababifo.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/merozibevanosawo.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/d6if6mbumqtlcl52c5d74he7m4/wajiza.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/sogubipigosifupabamugo.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wadoxinevurikusik.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97feb0bcd---83517900160.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/tatezetefitemoxuseg.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/zetizej.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/lirugujogibes.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/vezudu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a503008ac87---direkomute.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/6740517149.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/op5ol5p4dv6abrv5mjb1l9e398/28121563547.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/44302965107.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/12870074606.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3bdac486c7502c349366ed40ea9c937e/lurikiragajela.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6hov6lm851k14psugferpmc833/fonuzojadonemenepevam.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/jufig.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0c7b994c2---32545617559.pdfIn PDF document text
    • http://armanetti.com/images/vijaxebuxisisiwuruwa.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_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 18104 bytes
SHA-256: 62b1e48f507c6c26960674adec67f14ae84caf5e84769c33d52d37dc175d466b
font_02_sfnt_off00012693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12693 10752 bytes
SHA-256: 8da6adcf6cba12e59175a543f29308985464827faf0f0212342a39efa3d094b3

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