Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61005c348fe6dbc…

MALICIOUS

PDF

83.5 KB Created: 2021-09-21 04:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80f457a27d1b47cb1b59f1728ca52737 SHA-1: d6673f3fa5e3ddecf927e1e470145ebd269c1eda SHA-256: d61005c348fe6dbc6c1f986083d6e096d266e9fce3db2ca342a1e09871446738
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination of the links, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests it's intended to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://milorem-service.ru/userfiles/file/paridejafa.pdf In PDF document text
    • http://pusheng168.com/uploadfiles/20210908061928.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/fekuteveluzeriko.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bemigotudivebowegebubiv.pdfIn PDF document text
    • http://potya.com/80315705622.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/26293595992.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4a89bf241c8b496a8f92fbf46007cedf/fejetevabajozamozox.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/0e78da9f7191f563b142c4c590f2531d/mituruseweb.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/lerijabaretigefodapezoz.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca7f2c306b---56762206573.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c9abdf41d52ab79751fe23eadd60084d/98770015849.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/xovare.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/bku3jekuumo77bnmc6sro6uf00/bukanawilodemusuv.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210918204709.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/88795615345.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/gixexugeg.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/42362372488.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/45470645269.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/57693566479.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109130904407288.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109011647073747.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/34611811560.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/4850395596.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/buzalopixonepofudurafi.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/89982585303.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/wajepelefesobezolurefiv.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/75902122782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hack+tom+gold+run+downloadPDF 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_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 10592 bytes
SHA-256: bfa746476e0af485ec0cc1628b761ec809342ae5121d1d37e5e2060be742cf76
font_01_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EE 17596 bytes
SHA-256: 0e2f79c8f55ccf3a52adba2ac06fd37a5d73fa616f8db47cdefad371128a679a

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