Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c421f6f412351c…

MALICIOUS

PDF

69.1 KB Created: 2021-10-04 04:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b1c4539960855283cd6319899afcc2a7 SHA-1: e64dc3144a80b50c9a13007d4167ee523c30066e SHA-256: b1c421f6f412351c68b537c11eaec27f758aa9cd4c6b0d5aaf20f699ccf571b6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of external links, many pointing to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the high heuristic scores strongly indicate a phishing or malware distribution attempt.

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 https://mbzgogo.xyz/web/img/podborky/files/wetezisufebefexigonub.pdf In PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161583e10260fa---41360731513.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/29251306177.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/vovovokos.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/89332103587.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/netulezikatinokigivuz.pdfIn PDF document text
    • http://tianfonmm.com/d/files/sifujevin.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161498b71ce135---90375986289.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3e5a3565a24c08def7e3b5ea687d5ff2/53000400327.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/62202177643.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/2372313604.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/47614448802.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630493241/files/gupidofenagajufiwazejeziv.pdfIn PDF document text
    • http://rapet.hu/files/wekonegomukelobugaxib.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/jumedasazaz.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/joxojisudumomofosevufizom.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/18795633460.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/89849179889.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/20937889211.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/labodiwidisikenuvirota.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/87383284499.pdfIn PDF document text
    • https://krossi.ru/images/content/files/lutamagor.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/jopitugok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=total+drama+revenge+of+the+island+castPDF 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_off0000ae70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC682 15464 bytes
SHA-256: dd37c4ec85ee39013651d6884403215dda9997b2b7347075457288c3dea4d2f5
font_02_sfnt_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 10952 bytes
SHA-256: 8b4ca9f18e51d4eb438a58af1477b67ae999ce70f6de88941ecd95e106a6afa6