Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afb88af4afdefdc…

MALICIOUS

PDF

90.6 KB Created: 2021-06-29 19:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 97f2eac478e75b6dc60dba758d8365e4 SHA-1: 759b3da9a82ef85c0b31c40ddc9cfb3506e3ed08 SHA-256: 9afb88af4afdefdc560fad7fa8c4cebcba535e7afff717fbce28da1d3dc97643
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95'. The primary attack pattern involves directing users to these malicious URLs, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086405fa27ea---29406422474.pdf In PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/dg0r4guu0gfmq1hctbr1pb0g7t/nalozatimogirepa.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105140958107409.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/10d91e5a081057705d45a0df2942ad97/sonurefo.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/kixuxodawuzegivedir.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/4mkrju7dcdj1imgm2relca0ntm/fumidoveduka.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/fidabojimejawikil.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/86chhh9n3960q8uuu8dcm0c1p4/70780807341.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609731d2df425---67698677055.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/f1f33f498cf8b01c491b495d309735ac/nomafenotiw.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/51482757045.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/felapuvaxeriv.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8b1c18ae0a1d51cebb2d4a7c1008e0f1/fokirupuxabezuf.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a699953a92---71630050293.pdfIn PDF document text
    • http://tfforming.ru/d/files/92382427688.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/54971424576.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e447f1e3e6---zumidoser.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/47754578342.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/2399l5ugom0lvh912lsj1rpr11/63427026612.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021052015314573499.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/xofeseweso.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/13244353222.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/9k14mm793h2btj42c45s5jp72v/gatokuxezekuxevuweb.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/36057849494.pdfIn PDF document text
    • http://clarasonic.com/upload/file/gumitenexixorotefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+book+thief+death+quotesPDF 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_off0000ff7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 17592 bytes
SHA-256: c49ec79bd35e1962e800e46ae17e7c5a8db26f007cbbff46f45ab7a5286428be
font_01_sfnt_off00012cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF5 10644 bytes
SHA-256: 00f7553899b8375b2d8d231eb35f6b215015380ab9881904857c42691c0b7869
font_02_sfnt_off00014549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1