Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3cfc8ad1337ed0a…

MALICIOUS

PDF

82.6 KB Created: 2021-07-09 14:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0600cfada47b1fbaf53e3e0e3811be41 SHA-1: 411f94c814b5c276752fe8bbc7526c91d7e507fe SHA-256: d3cfc8ad1337ed0a4e8b0af54e2ec311480e450ac1135cc3634f36a22da67a61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. The embedded URLs are likely used to redirect users to malicious content, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://zoomkish.com/basefile/zoomkishcom/files/gajolepowixidetilafiwug.pdf In PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160861dcee8628---99572884340.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/g4noos478m5ukf1i5k4is52823/28618225245.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51b33d20cc---limotokedov.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/56bc1a3b313d52a737c83323570025e5/komekaranavip.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1ae70d135014d14c9e52e87573e75052/nozofogoxere.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b03fc04cc63---dubida.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/38499626229.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/02ee975c959faabad24ab14b40661256/sivoboribewemususuroruj.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/5287402851.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/25053765244.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f8d33e4f7b65874088197da273869727/felijuxoritedimilagiduwo.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff139d94fb---jexumufixe.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e467e5c12---88892977730.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb2c492f6c---60758626371.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/wenigukagonuvisulas.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/86680727942.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/5623816602.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/32269333769.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/96353638083.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/i4611qughkev24c3enkqv63gu6/manupuba.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/dufixeb.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ni3j311ovnmtoie8qc2ckohbl5/jubewevizajavevuzexojep.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/wimowikisom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=business+law+including+company+law+pdfPDF 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_off0000dffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFC 11116 bytes
SHA-256: 24eb7e8a87ff143de1095f02c78ef89ec30f9d547fdc9f24f59a58e39822e43a
font_01_sfnt_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 16656 bytes
SHA-256: 8d9f3a312fcf8fcbd9f3a3ec4706830ed3060c0071ebc3567bb8a62d794d9fa2
font_02_sfnt_off000124e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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