Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8e52aa2c01def1…

MALICIOUS

PDF

90.0 KB Created: 2021-08-13 17:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d129a1ef9d1bd3d25f1111075f71287a SHA-1: 9fb228d60f44ccb3dcdf68a3fc62c98927ed5c82 SHA-256: 9e8e52aa2c01def148a117c3c17b9a5631273b053ac81b35591130e46bb45920
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The presence of external URIs and a 'download button' lure suggests an attempt to trick the user into downloading a secondary payload. The PDF structure and embedded links are consistent with phishing or scam-related lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://pttaccounting.com/userfiles/files/9862551908.pdf In PDF document text
    • http://studioghittigargnano.com/userfiles/files/maripuz.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/58734699162.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ad788e79dde108f9282b36818e3bb73/zedipokusi.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16074d3ec2aef4---2863821287.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/maramenigekedusiveroz.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6p467r8l8gk8bbjvpe4hulsms3/24504371349.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fecc71567d2f0e510f0fbe855342e637/24529344200.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/buxiwopisipin.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021071412473873499.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/86ad7405e815b62c781d25a502ccc6db/jajagano.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899548307d2---50709382773.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/vakapudakap.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beabea69d0b---19274251997.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/17587500419.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/bb23f0382b4b0d58b028f7491f1ccf6e/84423563124.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/kkd89kegt5g8emishhth176eg0/58003396359.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/peripigo.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ou31pitv57hfp2u54rm4pi5472/zagapironuvo.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/lusugedufewomafe.pdfIn PDF document text
    • https://devismesport.fr/userfiles/file/repivodefawizejujom.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/4587600749.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/pigixunufifotuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=filmywap+saho+full+movie+downloadPDF 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_off0000fd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11513 16988 bytes
SHA-256: 63ef0350416151b7b6b7150e14d82c1c355f2dd505fb0821876bc9150c0b857d
font_02_sfnt_off0001415c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415C 10908 bytes
SHA-256: 75eec37bae53ccfb637581ccf468509b5d8acfcce3e2c68b6cc4b2c7a762e466