Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead7b9513dfba344…

MALICIOUS

PDF

86.6 KB Created: 2021-09-10 10:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c72876f3f7c2e636f6af1626f56dcd7 SHA-1: fa129dbe98c1755e33c8c820ff095c2912acb60e SHA-256: ead7b9513dfba344dac885bc4d713fb2b702e3d25abf3f9a11dfaf2782f87286
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document instructs the user to download a password-protected archive, a common tactic to evade security controls. Numerous URLs were extracted, many pointing to compromised or disposable hosting, likely serving as download locations for secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cn-daomeng.com/upload/userfiles/files/914410450a56de3a238ac389f82fcd94.pdf In PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/21508946022.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/bosokawelofanevezodefaf.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/bozanowetumunegakux.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/jinate.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021091012203773499.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/5932401368.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613686063b620---7382521761.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/gonogilujorabobup.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/20367021198.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/78980f3209222984b99ea185c29ca62f/906233836.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161354df6b3742---90975232029.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/jisexunol.pdfIn PDF document text
    • https://kawanmto.com/contents/files/69801981130.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/zugakenejunamiparutixasad.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0319f409b---dopopisifosotitexalimi.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/meruwuro.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/30027727273.pdfIn PDF document text
    • https://datawire.gr/files/files/sogitalilalakidiwim.pdfIn PDF document text
    • https://bem-sa.com/img/file/lufip.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/35600642642.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/10267324578.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613358110af59---zavobuwil.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/nitixif.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613109927c8e0---34824341796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=netshare+apk+fullPDF 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_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 10308 bytes
SHA-256: 32ef5a8ac02a93515df11c048da7094bace62ca3895371c7a6686443a5e95669
font_02_sfnt_off00011a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A33 19584 bytes
SHA-256: 03a007e3e9a7fbb4e1941d6c3ca1375c38e286b0e9627c2d135677685c423758

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