Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c2ef82404d8a28…

MALICIOUS

PDF

77.0 KB Created: 2021-08-17 04:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80530fccf9fdf253b75b62348c04e5e0 SHA-1: 96c255506a99d1dd82ece7b524f5a3b976dcfc90 SHA-256: b0c2ef82404d8a28ca4c5097b31d7bc12e9961c018020b4bd4319e7cd85ebe62
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gikguamerica.com/userfiles/file/15122330866.pdf In PDF document text
    • http://m3hotels.com/userfiles/file/farebi.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16082312448c8e---93869694047.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16111b71bc46f4---xigemanapavakuto.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/giturilirimit.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/0dfe9bf93c4055819ec771f7126dda06/90537344599.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/95051550467.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4adc79fbb---xotewag.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/14379405127.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ucbja3fnp01erkd66b6360s5mb/38208537477.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/cd222496162f0bc2f342dc348d128e30/gobososagugiluvufu.pdfIn PDF document text
    • https://baongochoa.com/upload/file/sozebetowojajosiz.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/10972520551.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/70895955586.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/75077572205.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7cac3e84b---41576959491.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/1698df5304a33d590174d4d3602b3938/sibagazixazojeb.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79ceaf2d8---buborujimuvolokividu.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/51600025365.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/toleluzetabisosibazune.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/91188616209.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a948d62358---fofusema.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/f1ade7f3751de75164c16436b41a40a9/segev.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/lmc2u5bfkmig49v3rcclenm2qj/nidakene.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/53190536844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sexual+vs+asexual+reproduction+worksheet+answers+keyPDF 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_off0000c971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC971 11248 bytes
SHA-256: b27baa6ffc1da5198789df74802c63210a1c4638f9098c94e0a3fc42a450e423
font_01_sfnt_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 16060 bytes
SHA-256: df06a6a03ef78edd9904a71c8229f5ee1c879fd61de5bffd9b6e7ee61070a867