Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f204546db7f80df…

MALICIOUS

PDF

79.5 KB Created: 2021-08-23 11:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2042d9cc51773d1dfb9eb053d8eba7d9 SHA-1: 9fa1641a98cc06f2edb365467d7f4446525aacaa SHA-256: 8f204546db7f80df72ab4d1a40ac2a160196010ba8c10e90ffcc7a15d70713a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's part of a link farm hosted on potentially compromised or disposable domains. The presence of external URIs and a 'download button' lure suggests an attempt to trick the user into downloading further malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://apluskleaning.com/admin/images/file/70083990071.pdf In PDF document text
    • http://easternsheep.by/app/upload/file/48234775230.pdfIn PDF document text
    • http://erpos.sk/data/files/24801176072.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/vanov.pdfIn PDF document text
    • http://beiks.info/public/file/9547840692.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cba53de6a---kagexazujujekixo.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/balololi.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/64918126891.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bbcc7b79c---gupojajibupowosanawi.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/e4rpstjl59bevl5bqk602mh0sr/bapisodudopisarekasajiwa.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/1d9e4ed8c4eb957e21e3c259b36d9cd0/foderusoluzelelo.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/fujexutobanotuxujavowuj.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6819e9c9cdf8363570af6c35b116afec/janutewexijogedo.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/kinasoxila.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/kuwuloxud.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/57115866734.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/34137385362.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/586acae7ec729c344cafd3b88165b2b3/bedopixozun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=group+2+notes+in+telugu+pdfPDF 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_off0000d262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD262 10768 bytes
SHA-256: 8a6374e36c33794e93b41ee556dd0988047f9f330c9dacc4706b7dada70b149e
font_01_sfnt_off0000eb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10339 17540 bytes
SHA-256: 45b186e9729543d6a92220905c9fa794f331a0c44e2d9d0249b2db91d1a94213