Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc462cdabfa30f6a…

MALICIOUS

PDF

75.2 KB Created: 2021-05-18 01:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87f2861baa920025e4caac547ba91e66 SHA-1: 894fbbbfb47b6666a0eb61e0da18097b39f26f21 SHA-256: dc462cdabfa30f6a9fe2aab9eb538c73139c833fbc267a3660170ad452859269
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains multiple links to external resources, many of which are hosted on compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The presence of a 'download' button lure and the ML classifier's high confidence score further support this assessment. Although no scripts were directly extracted, the PDF structure and embedded URLs indicate an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://akapacha.com/userfiles/file/73729425365.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094b06702491---6071890660.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bc493d817---zukafekazebukidosis.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/qqhi6tf8sjkchqma86lkrkdjc6/mejegelolijakogevovado.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/d97a6508e13ea93a74d6780565ddc68a/tevadoxijipukatuxa.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0b9ccad07c074ac23ca826c5548c4602/82923523802.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cda5461a4b---56012368396.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743c510a4b2---jilolek.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/723981f8ea10f6241a3a4d35ddde6070/bowunurura.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6fdcadc8c944ec2cb55f5b3aa231b490/97803219847.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608986c481953---3148667810.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b27507910c---ruxanexununesonedex.pdf
    • http://flatadministration.com/uploades/fckeditorfile/56899043325.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7091936f0---60610202764.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/1bc6d0e91de1c212b9a3603c273d42de/lasur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+question+of+palestine+edward+said+pdf+download
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e614.bin
e4634cb844eb106e995301102df2a02ac942b11dd37f967b10c57669363ad5f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 5296 bytes
font_01_sfnt_off0000f821.bin
efa98df96ef8cb8504f08959bca58127d2d9bb44b732dd206e2d8765fed633fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 11124 bytes