Malicious PDF — malware analysis report

Static analysis result for SHA-256 afffdafd6cffd57e…

MALICIOUS

PDF

179.9 KB Created: 2021-07-03 10:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dc5fdb753aab4319ce53f5b79885ddf7 SHA-1: b84099f43d4ab67feb633b35eb53915140b1a9d5 SHA-256: afffdafd6cffd57e8052427d4b2e31b597c34e8e19d72a9e81ab186befce4f87
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, likely intended to phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the PDF structure and embedded URLs are sufficient to infer a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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://app8itebarandgrill.com/admin/images/file/gikevuvamuzuzidodanowav.pdf In PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608604db89be6---zuzos.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d04c5c24f---sopomanuxuxuked.pdfIn PDF document text
    • https://pilisilovaskert.hu/ckfinder/userfiles/files/12126610591.pdfIn PDF document text
    • http://chikatere.com/Upload/files/82648455039.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/be51fe06e0495430bc66ce15b608f5a0/dadew.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/3i5ptmi8r4301auhv16277cd80/vijorewape.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2b1abde8---sapuzejexedepixi.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/9ef4d068e41649bf9b6d7effb386de59/67791552762.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/0dce491ff11e30a907d48a3f5af02c24/98093557538.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b650b2464a7---71135155673.pdfIn PDF document text
    • https://arerp.kr/data/file///guvig.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/97193376974.pdfIn PDF document text
    • http://www.manorbymajor.com/userfiles/files/44332481744.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/84196172535.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa77b277554---78510825492.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/tedusi.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/e0fb702eec7f873951105c0be459da32/48009810085.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210625095324_284934701.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b583c300d9b---66174754142.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/megix.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade5d752bff---jijumakubizuzopok.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/88146941097.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cddbaceb63a---datug.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/babcc7cf46adf6ac1c949ee70f9369e3/ronevamizesugodotilexoziv.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///timepaxederujufujelinapiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=goldstein+chapter+4+solutionsPDF 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_off00025546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25546 21880 bytes
SHA-256: 38321b482b6cfe474dba61add9c2259f412cbc267e0dab3a0660e6e1d5e36109
font_01_sfnt_off000290b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x290B5 10828 bytes
SHA-256: b687a28f4b8d11ca9681d82c262145e06fda0b55010b313b5a52f51f947cc7b3
font_02_sfnt_off0002a9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A9A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1