Malicious PDF — malware analysis report

Static analysis result for SHA-256 677abf5e8272a351…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 05:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21a8daa564181e06a7e92dcf6f1c85bb SHA-1: 5b2d63a018d3751576c8bda3ed8b6c6fead7ad23 SHA-256: 677abf5e8272a3519e363bda8dde6d4c2a1e2b2e3ffff6d3388225350d46636e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various unknown PDF files hosted on compromised websites. Heuristics indicate this is a link farm, and the ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ca00c4cf---muminitevunowikiroxotuse.pdf In PDF document text
    • http://biznesfishki.ru/files/userfiles/files/66051887757.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/76622346849.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/21856213707.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/07uhjps1g4d5vnb1vb4pdqaa8i/rezotagedulexusesewabo.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/jemizekidagawebu.pdfIn PDF document text
    • https://kham.vn/userfiles/file/23967921430.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/hiaq93rve1qv6ikpd66lf24ht0/zafewixewe.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/vakovulesisirunabodaw.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/14856436508.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/beef8eb06026d9956195895409e0fff9/51423863217.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/26563227706.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/dojosupenatebu.pdfIn PDF document text
    • http://zzweien.com/d/files/25805800294.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120fea5a1395---9637798774.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e75e6e4d51---vatufemelaloruxikekorogi.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/39019783866.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/46329722337.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/64986638502.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/xoluvipefiwuziji.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bb0101563---89646045497.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/59506199319.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/zesosakoluxubud.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210814013443961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=greater+than+less+than+sign+worksheetsPDF 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_off0000d5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D5 10604 bytes
SHA-256: 4b96f50d5d67ba35478b219cb9ea602ceee1919ddc5a89f94d16c7c875bf4ea9
font_01_sfnt_off0000ee1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 16892 bytes
SHA-256: e98594302f1b0d2f81b1c5950e336d70f95fd08f745c8da3c270f92245b70976
font_02_sfnt_off000119cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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