Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a68ec428bcc224…

MALICIOUS

PDF

86.1 KB Created: 2021-07-13 03:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a345c7a5272451ca8e95ab8f064c4260 SHA-1: 0e7e232011428aca609145d0cffc9fa883eb80e6 SHA-256: c2a68ec428bcc2241d7ecfb925dc86ff9d7c987d2dbd7db1ae2237ae983786b2
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a primary purpose of directing users to external websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide direct textual clues, but the overall structure and heuristic firings point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://archism.ru/uplcv?utm_term=constipation+weight+gain
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbdcfe780c3---98232572351.pdf
    • https://foundryindia.org/userfiles/file/12186820432.pdf
    • http://capmar.eu/userfiles/file/90172327223.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084140d306ee---bakinutiwexada.pdf
    • http://www.biotanika.pl/upload/file/39250308747.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a00c2e5e2---gemulewexikupekalibes.pdf
    • https://davaocarrental.com/images/file/jevunefaje.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad883a652---85283969042.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76dd1936f0---79661621761.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091dae08329c---zixulunewur.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c12d6acf631---kutezomus.pdf
    • http://humanitool.ru/userfiles/file/duboburiz.pdf
    • https://blindnow.com/userfiles/file/63325273689.pdf
    • http://zonwering-belgie.com/ckfinder/userfiles/files/28840147715.pdf
    • https://banghenails.com/upload/file/98886887746.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0280934572---wapufotokunujefi.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/0fsh6endje4n7ve8b1ivgc1ipd/laxojagidivabojudub.pdf
    • http://posekatzahradu.cz/files/file/1343559076.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac76eec71---45592100939.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/0195a5150a6c3472950d2d29ecfb8111/59016776766.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f01556e93---zutumebitaxupifitedumazo.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/r5cnoech5pls6fkefhngsf01m7/65948722054.pdf
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/38468762813.pdf
    • https://soechi.com/userfiles/file/puzatanelelekumax.pdf
    • 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_off0000ecb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 16792 bytes
font_01_sfnt_off000104ca.bin
74b4dfc4315276fd104b2aa43c16543e92a764540472f75f8d7b95bb078d6d82
pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 10504 bytes
font_02_sfnt_off00011cc0.bin
438cd81ecd6789bdc6369bab3ce0afe7c81bcfccffb2a7837d30336e5f28923a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 17296 bytes