Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85b9aa75667d9b5…

MALICIOUS

PDF

78.4 KB Created: 2021-09-09 18:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b9ca7162b6c0aeae2e1b6d23aabc2c9 SHA-1: 48c7424241d8a4baaab9b4dea09754d515ac1678 SHA-256: d85b9aa75667d9b5ffb1b1b49e815d3db50dfa8f8423b8fd738eed9ba9897ab6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and potentially malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://bodegaadrover.com/userfiles/imagenes/wudofamibiga.pdf In PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322db8548ba---nuburenifupuleturimab.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/19116219794.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/94951405563.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/99239792872.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/37848459715.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/75281189117.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/suborewajumimixijuradav.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/76375528042.pdfIn PDF document text
    • http://abwrva.com/uploads/files/tojujirupivagavepelos.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/xonizubuxobepababawaxi.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/27790332455.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/pojeserova.pdfIn PDF document text
    • http://chipgene.com/image/files/20210909_150306.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bfd80d2a9---pilepabiredokoxewegapa.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/85116595702.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/43288003746.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/90110338188.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/87943903376.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/06e2ded4ad8f1ab5ea676f4d8a4f3c4b/45647664701.pdfIn PDF document text
    • http://adice-area.com/pictures/files/xudejuda.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/51892816217.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/nogigibazewajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=factory+reset+androidPDF 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_off0000ccec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 18544 bytes
SHA-256: 9c42b6c5dd3174f1de1f3ddfc5ceaae66403cd25603c430f65558dd8d7f616c1
font_02_sfnt_off000114cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 10408 bytes
SHA-256: 2ac012284bde08f6db4adb89b805d30f9df602220ab7e0b9557917c172b2f672