Malicious PDF — malware analysis report

Static analysis result for SHA-256 4254b04d3d8192a4…

MALICIOUS

PDF

83.9 KB Created: 2021-06-28 09:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3a06ce57d83085c7cde254055f3a39f SHA-1: 980d8e05764c17897a47ce3b5c2b6d25242ec362 SHA-256: 4254b04d3d8192a4d692ca2b4813e2054f8aa2ab389f9f1573d012491bd7b9cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised CMS upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded links align with a link farm used to distribute malware or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://gpe-el.pro/ckfinder/userfiles/files/xixaki.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4d23e1c4c02f185aaa98ae37f018b06c/gafipopisegejekutabiv.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befb1344a44---suzixezirotelexetax.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rimakuvidubelurejo.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ef1c01b98---16567213140.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ees9aa8q5jjsmk2q1pheg8u0l4/bovefuzanunafikeromapi.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/b4e7dfc03eea91046fa71aba9a579af0/bojoxugudipoxawere.pdf
    • http://ttlh.vn/storage/ckfinder/files/mapoxipadumimosagivilez.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/op5i17l1ql8o972mc1p81bt617/luxape.pdf
    • http://monkey-do.net/userfiles/file/zedujixowowilowu.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/gkfn74vvmoi7vv18na0b7916c5/10659835156.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f5e4041db---18842430237.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828dcaee977---90399840561.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096fa3cb488e---sedopukikelapogujevepudu.pdf
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/11523930128.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/59ae47b537273c25f6fbd7423cecbcbe/noraninogelarotek.pdf
    • http://ortetel.de/kunden/schurig/ckfinder/userfiles/files/89828390143.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/9f64ee7f22903639a73263cc953eb8ee/80978584143.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c03c3fa005af7f2073f8824f4010a0b6/gibibulumalajurex.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a704d041e83---78801866981.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af31871e685---rigadujuferipag.pdf
    • http://www.siposferenc.hu/html/nifufiwakoje.pdf
    • http://zkojicin.cz/userfiles/file/51539310492.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=earth+leakage+relay+test+procedure
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e307.bin
7c3f30c58ae499e30c1f20d35ddb11feb1fd5ed423fc29f00a886428474d95e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 17676 bytes
font_01_sfnt_off00011127.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11127 16792 bytes
font_02_sfnt_off0001293e.bin
c95cccd530f131026b02f25b021fce28f3aef28ca92a26f6475d5e479189d084
pdf-font-stream PDF embedded font (sfnt) at offset 0x1293E 10888 bytes