Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdacba338216487…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 02:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8a84a3e931c5f1fe33ca8869e6f6e954 SHA-1: b36359da84e98559cc78818958718aedaad789ee SHA-256: 4bdacba338216487822bc3f24083b42b17cbe64b1f74ada56873c9e0fc3aa502
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pistant.ru/uplcv?utm_term=thoptv+indian+app PDF link annotation
    • http://sigmabhp.pl/userfiles/file/38598353840.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/51399985032.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/19645582697.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/90935154497.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/retujisumavamuxalapuzuw.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/54620447243.pdfIn PDF document text
    • http://teifsepahan.com/files/file/44491176694.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/38717428974.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/98005595588.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bcec1bd3---xozoniwigamafofivi.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/6852873572.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/jadivit.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/pewulomasinebit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138543ae45fc---41702164787.pdfIn PDF document text
    • http://sdes.in/uploads/difujaruperoje.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mirarafovoto.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/46383232148.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/2051889550.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///xatelolobuwanuvumuja.pdfIn PDF document text
    • http://taociren.com/upload/file/210908000247915752ya13w5x96tal.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/27095887700.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369139644cd---97705655196.pdfIn PDF document text
    • 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_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 17148 bytes
SHA-256: 7fc8c780180be574502e17c4b7a6b790481ad5dc8e06b73a06f42f4b924c3046
font_01_sfnt_off0001091a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091A 10072 bytes
SHA-256: d5eb346504cdc44ea8ce42e85b2aa206b43689846e801dc7fa8ab6a7f28521d0
font_02_sfnt_off00011f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1