Malicious PDF — malware analysis report

Static analysis result for SHA-256 001accf7a32a17d6…

MALICIOUS

PDF

85.7 KB Created: 2021-09-03 23:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9380d2d6d6bb4abc82dfb70550d240f1 SHA-1: 13f56ac0379a6c580b03cbb1dff4812883e55007 SHA-256: 001accf7a32a17d656f1ebd4f73ad5614ba4db088514ecf4b80930377fb1f0b1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but the heuristics confirm the link farm nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a0d4d890---bobetafa.pdf
    • http://www.pics4us.de/userfiles/file/47250002239.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d084be98ae---fusalojazugowagevofatupi.pdf
    • http://designklasse.de/ckfinder/userfiles/files/verowosetorizusemugidiwun.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161051f8a6b4b3---6554134635.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b9373ab54---duzusabokeweraj.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/856a2dd299c59b8b3c970e800f6278b7/14610868819.pdf
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/natoxuzuturulerebof.pdf
    • http://congseng.com/uploadfile/files/xuzasebajapuzagiges.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82ad4bf672---didakomepokovavalotoso.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/468b14d98112af07b2e92d2863fc9549/6831544606.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73c8962abc---ranavegubixugapixi.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd146c99f3---garilarukoje.pdf
    • http://fittbike.hu/files/file/2632980835.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb8b7aff6---zivatabafanirubivasu.pdf
    • http://614move.com/clients/4890/File/81648535311.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c784cc5c7---sageb.pdf
    • https://tigapilar.com/upload/files/gewevemamutosapedesekapa.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/4688048656.pdf
    • http://angeladaniel.eu/uploads/files/lizepumateralapajekogot.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e95327d39e---mabezupanurizezevamovo.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae623957f12---xajeronekamajuvewirekepe.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609fff5e15b7d---wolosakezumefimafenofu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=termometria+exercicios+resolvidos+passo+a+passo+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e656.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 16792 bytes
font_01_sfnt_off0000fe68.bin
f784a3e8a63b6b32d7a5eca02dad056450743bb043f72dff2b9ab32f2d3f4183
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 19380 bytes
font_02_sfnt_off00012ea5.bin
22317aa372f19dcc896cdf946bae9d32c5dcbea058c5791514dd6add77f254bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA5 10808 bytes