Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2432e148e8f783…

MALICIOUS

PDF

109.9 KB Created: 2021-09-22 18:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8962cde53a1f8f0523f9532f1d1883b8 SHA-1: e806ef84b0a6205fecd544a934bc89d64a8194b8 SHA-256: 2a2432e148e8f78399dd76211eef19acbffcdd6195a905d686869e50d14db8e9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised WordPress upload storage and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.agot.pl/upload/file/54094623095.pdf In PDF document text
    • http://profil-metall.de/content/uploads/file/mesorinisujara.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/85163942364.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/7c65bfe63ed9836d0845b7a1a662c744/guzitezoxagigipetuvo.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/64212142090.pdfIn PDF document text
    • http://askort.pl/Upload/file/6979934900.pdfIn PDF document text
    • http://iucecb.com/files/file/32985724118.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/42444199237.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/paduzefejusekib.pdfIn PDF document text
    • http://arsvet.ru/img/upload/69625154626.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/53161978934.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/33023144942.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/lugajexenupowebaxaj.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/81087373711.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/bt43tt2ef39d8nf484mbv4c5hr/306911835.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144f6e37abe2---3502917211.pdfIn PDF document text
    • http://sushifactoryazusa.com/uploads/files/65323923666.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/22054394120.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/61707894069.pdfIn PDF document text
    • https://miet.hu/kepek/96827081468.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/28728817276.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/22942942442.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/28954205819.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/jejemewebufefagatikeze.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af49ab6857---54975791465.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/lekejevopezozulusafoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sideways+smiley+face+copy+and+pastePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_01_sfnt_off00013761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13761 23712 bytes
SHA-256: 08520bb0e8d8c6a60a684d44c66d6de21b0bdfe40ada3c871a7692f4205949f4
font_02_sfnt_off0001761f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1761F 10956 bytes
SHA-256: 0e7d61e465fa7940169a290006f96aacd135209e90402bee047b7738714db7ee
font_03_sfnt_off00018f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1