Malicious PDF — malware analysis report

Static analysis result for SHA-256 7feb7d8bcac8bfab…

MALICIOUS

PDF

87.5 KB Created: 2021-07-20 09:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 970fb01dce86e74a2e880388193d0ce8 SHA-1: 7316a7f509742944a9283cab961f66c18cba3d83 SHA-256: 7feb7d8bcac8bfabbe5a29f5f7e67342139ad327bc22421bd03d04978abbfff1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links on disposable hosting and compromised CMS upload storage strongly suggests an intent to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ekhoron21.mn/uploads/files/koseforokavubo.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e40370dad38---nisitakowobutujevosopij.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/lupimovaliwuxixabaruvofus.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/xorexozamunoluxevibu.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/828f3ee3526f57c940ea5b7b333e43a8/seregedegexog.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/48565561653.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/3041586659.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/knq9v993tugdpbmiq98o58nja0/38701158247.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vaa7sjr4oc639k825qusrm4d2h/74626286924.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/df422f44c7829dffc9f6962433fd0a2c/warelodunilikifo.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/jusufebarepujeb.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/48366628836.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/mobufinabu.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/wopiselusowigilevuwi.pdfIn PDF document text
    • https://mvservice.it/file/gobagarezuvegewabepodana.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/8sbb5s1p2f8ikc13dqat13g06a/sodiletodod.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/658f663664cc66ea9099f6f22804a8ff/74864517129.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/33409278757.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/42421151240.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbf66e6c8c---12630785916.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a0790737a---vogesefo.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d53521395130a77cd48908af447e18dd/larakafakebudefalarakut.pdfIn PDF document text
    • https://heyratacademy.ir/file/48601519916.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/vopinesesokigugujalum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+a+strain+in+musicPDF 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_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 10288 bytes
SHA-256: 515b60dcef70a9453526aa7f3775b8430724cfb9c34a69e38219e3c560556869
font_01_sfnt_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 17740 bytes
SHA-256: 657937c293c534e4d9954eefabce6d431cfac148a3c7d6e29f4e454d33f72946
font_02_sfnt_off000138c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1