Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bf0e46862beaea…

MALICIOUS

PDF

94.9 KB Created: 2021-07-24 08:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 75db94658cc82dc9a423aef507a276c5 SHA-1: 9da926d3e3ea721a91c106a1338dee77088f4fb7 SHA-256: a9bf0e46862beaea8808c7c4c9e2d9232c565d28827e78773b863bb374982a1a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure itself does not contain readable content, but the presence of these links strongly implies a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mp-hd.de/data/aktualnosci_imgs/file/85596000972.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f72f25272---5328632924.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ed8dd6a94---vawogadof.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b53c27585a94e96dea20e1370c1b37c5/mizobugejizabizoxula.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/fevdhggdif2dltd06sv3osiir4/54881548144.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160efd515d865b---15992510337.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/larafaniminurefajej.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16088797f74bb3---88181874684.pdfIn PDF document text
    • http://tano-cable.com/d/files/23244931655.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d20964b24d---tenukuzupep.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/laliki.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jto3ak3i1c8qkalof8vjrd5du1/tejoganuxajafonusikoxukod.pdfIn PDF document text
    • http://art-ball.net/files/file/logonozijut.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dafa2f3feb3---bopijagafujerekagaxibu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c6b618efe---marivi.pdfIn PDF document text
    • https://areicon.com/images/file/sonewawusisujepema.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714be34e580---26569990600.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/desisuvuvinibijujatosal.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/75369630973.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/bivofukuvemodu.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/46655631397.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/sofifinowefaduzokovazidab.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608114b77cb89---kafonepadetemomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ejercicios+resueltos+de+potenciacion+y+radicacion+de+numeros+racionalesPDF 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_off00010c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 17536 bytes
SHA-256: 0d2237d95a66a84b95b462605df12facffb5a7b4b4b5f7900feb41b8ca56849e
font_01_sfnt_off000138d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150EC 11000 bytes
SHA-256: 403ca4c83c89cea0479dc08192140eb0addc4e345bb94ac8a9b9af00ba4800e1