Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8db22fcdf44a96…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 13:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 912d7703988bfc2b139fc4a7b4c25a4a SHA-1: 9c800f82e0ffe94670fb80252a44d014358c1a86 SHA-256: 3a8db22fcdf44a96bc80181478416b9b9cd00f96f66240fe50138d7253b0c80b
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs, including one with a 'homescapes hack apk' query, further supports the attack pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://12shio5.com/contents/files/16832704930.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c689519abe---82166738745.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/45639752778.pdfIn PDF document text
    • http://wmsone.com/eimages/file/36074324105.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/95504785740.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/vitipitewizur.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/3858676306.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/17574993403.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/17299002905.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16141f0ae6b48c---sonaxefujobiletukuvufo.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/nefuxivuku.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/5524777154.pdfIn PDF document text
    • https://webaprint.be/img/file/46445065559.pdfIn PDF document text
    • http://etnorom.hu/pictures/26824771594.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16139db1933b22---94092063745.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/35673518112.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/51461727786.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/88478440750.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee0e354237---99740872667.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/pimofexulunobigagob.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/5301858937.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/menanagibezipevevubibibid.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/647569030.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9698de42---58592579185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=homescapes+hack+apk+unlimited+stars+downloadPDF 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_off0000b91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91E 16648 bytes
SHA-256: f4bab20bc0c40c3cb448c24b6133e58e3ac5681a725a8f30261452bdc706770c
font_01_sfnt_off0000e3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 11048 bytes
SHA-256: de52a045f9f738532c5da1b962df45a9109a1164649869e00cf07ecffb01966b