Malicious PDF — malware analysis report

Static analysis result for SHA-256 8554b92a84412767…

MALICIOUS

PDF

90.6 KB Created: 2021-06-29 02:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 995bae1890137f0f2d9843029a76dd4d SHA-1: 7a947f0a3bd75bed62cc6763ee7cefa3ad95caba SHA-256: 8554b92a84412767cb6f570cbab26fe9f4981b8b4053a06d18e7097923b52afb
156 Risk Score

Malware Insights

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

The PDF file contains a link farm hosted on multiple compromised websites, a common tactic for phishing or malware distribution. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc60811cad---dolofufenasagipux.pdf In PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/ramubipidifalamazoxe.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/jopudixiwu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ced5e6caa---kiretipijesibi.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1cafea1e0c3f05e64efc4d10021ca80c/39975941733.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/hv68dhpsio5h8fbr4rsbsp7962/94732861173.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/9frj3ihp88d0k23dcms37bmehm/46113722286.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6937e782fd---41531695958.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a975888dcbe---xasosedaxugisagerilazedat.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb88bf4a2aa---dutafezutaludadimejogew.pdfIn PDF document text
    • http://paliukenas.lt/i/File/96905594934.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/gadubokavo.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/759271f320e5d321f909cb1ea121ca2a/rugipigadoromuwe.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/e3aa3dc240089d832a5a162bb104ecbc/28835243583.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/dc87e03966ac65815a7fe23dd10d0a0f/69118611430.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/d6284a291dc15436e1161e398823abd3/96949554951.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e350b32e37c681fe1e8d8210d464c30f/19941094282.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/98710441804.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b66b7aa3fd---48645984234.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ecf85a58cbcf5e1eae755632adaf2b1/givewakafewojigunota.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nagapidofozavameliwibaj.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/743a272ae47ad94fda9d9a14be2ff746/xunidulalejuvijigufet.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/tibunigizugukeg.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/23594653575.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/vinajesevul.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/38a3125e102d41af247c396ccadbff2a/38592556797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=wylie+anesthesia+5th+edition+pdf+free+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_off0000fcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BC 17492 bytes
SHA-256: f972d5d81e21e9debddab9812e10ac939cd07ac02f424ebe545f7ac68cb669cd
font_02_sfnt_off00014183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14183 10920 bytes
SHA-256: 08e08e5b7fcc21153cd9cc1c2ce80923efe42c2bfb4589ead9911d700726bac0