Malicious PDF — malware analysis report

Static analysis result for SHA-256 882029b344359310…

MALICIOUS

PDF

121.4 KB Created: 2021-07-13 18:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0d8c71a559ce8ede066d9b0d06d0a713 SHA-1: ad48f243c94771defbbc187b7d69f16a4642c4f6 SHA-256: 882029b344359310678817034a057791deea25cfe249222b81df6aec70b030d1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ca0e2854db4f524987d946d51a874b0c/55954972860.pdf In PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c47bb386c0f---jasaduzatesotugalomip.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/12e21ccf8d26719c312eeee42c1165fa/kazotojutisozagoje.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/f559b630da6de89b15d0c8dc14a7d5ea/vofowizojuxivefi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160847817026f1---dogikazupibosorafu.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/ribizogukisegatuzanix.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d39b1ef97e1ec1438ffc9a17a57c9302/50161643973.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9eff4aefc5---wawizufol.pdfIn PDF document text
    • https://andana.us/files/files/28481627411.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa46a3a1a---rusez.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e17d0f4311b2322903525dd3351c9a49/48746516196.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/606b233c5e41a2ec39d41f1203b69324/57488125166.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/82484761700.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/0d0tqvan2dpav1fq95q9006l25/bosanebalodiza.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/kuzozulimerenox.pdfIn PDF document text
    • http://polletnv.be/uploads/files/45619118153.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/51116928607.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abb79e4559b---melezeluvovinepoxojotud.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/mevirojofurowabupibamiwim.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26adfe0264---44376946466.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ad02f3c7e---59472806806.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a87cab8e3b8ee9634cc1f001f11524fb/66630048254.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/lajadeduwufokexinu.pdfIn PDF document text
    • http://tipiland.net/upload/file/manusisiju.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/punawijijepofamomuputupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=professions+with+kPDF 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_off00017ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EF6 16264 bytes
SHA-256: e082e45aa026ccbbaa2a29cda4129e6b28ce31f8a7eea079645727aeaa32bf72
font_01_sfnt_off0001a8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0F3 10284 bytes
SHA-256: a4505701a9ec4d311056e7b7aa04b784431861c8b396679a0a15bea2fbe4aeef