Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd33b210fa459c60…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 05:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f02bc67477c737836d184822dbe6d84 SHA-1: e6b8b2d18a06112df3ca6978fd78793b1ba40c7d SHA-256: bd33b210fa459c600c277f8d5daa02edf46f8aed7de358f4fd60cdcc166d3569
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm and a callback phishing lure, suggesting it aims to trick users into contacting malicious actors by posing as a legitimate service or support issue. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns that often leverage embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/baterewasu.pdf In PDF document text
    • http://esejsc.com/upload/files/53273695805.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/jijamisibuvaxirow.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c1763f39fa6---86802908622.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a91b69e8e3c---nuwowodal.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/45f4672a1a22574ec0ea0eefcb72e967/7161701245.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/toruzafozafifamako.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/u71h9n42em3agq33i2sk8fgem4/49532032320.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/4c6129a09a4c5ef6f9c28a35209e8bde/55710741138.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/fudixapoz.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/zexiloso.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/jojudako.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/zubivivodofodesawodal.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/zuwagigusulotikotawu.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/36840256486.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/98965195487.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/99953163751.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/73946211878.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/lefufanowukedesabefe.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/5f7dd39a033905efa5cb7cf02c8beae2/jesigoka.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cfaa08539---vubidipavibumewok.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/55452267656.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/kost18vkp3noe1t58bgff43l11/murolusulufexoxisobo.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/kudega.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/2877936435.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c59ce55ee8e---33920989511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=que+es+el+analisis+de+resultados+pdfPDF 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_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 10652 bytes
SHA-256: 82ee74e8aa70531d416c463b3a6f8d823f107f805963676042f6f169d79ec24e
font_02_sfnt_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 17688 bytes
SHA-256: 811908e0ca0c4492fcb3615ecf261a112754cf79ce47f5fe15c28fbc54e4021a

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