Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c1fb54b3b16f33…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 05:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4c5c41871e18eed115fe16dc5d957e77 SHA-1: 8c0f7846e46b59e82e7ebb3b2361bbe7dfd46c0f SHA-256: 54c1fb54b3b16f332f73de47baa458dbf53450be1b6241ec56fb3bcd14ff7058
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous distinct hosts and URLs. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c21569d9b---30202750017.pdf In PDF document text
    • http://arohitourandtravels.com/userfiles/file/91100526637.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/imfjc9eu5e1f7hnbt54pgdb34p/relobu.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/mabukaparewadej.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/34489195997.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fee653d6a66---xoxumalijiz.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/13386099773.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dccc39cb29---87671166720.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ab5380398e---motumigu.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/renesusagebebawafajuku.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879cac388ba---74863910178.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2700e019c---rowegud.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6703bad6e---bajiwi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba7d3219b---34930239998.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/54721554862.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/33676175745.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a6466d750add82d7ddf755853c139139/sategipitupikavoluka.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/66959b6cd40b66134c11310dbff860b5/8021168952.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/91207210230.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/g1r5b87eqttn58vn620i085sk1/96508935086.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5d10c7eb---83468458167.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8421ec1e23---rojifetekuwaxowedisajonu.pdfIn PDF document text
    • http://apcmagon.com/userfiles/70846382683.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ps3khh2e4p8fer8e3nueu3toan/direbidamujeni.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16096966218c30---zetajisogewinigali.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/cbps67g5p07ive6vv3icu23r21/jixidaruduzokonigonopad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=moldes+para+manualidades+navide%C3%B1as+en+fieltroPDF 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_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 18372 bytes
SHA-256: 5e6a8b53cb6c2c765f38933b758bf028b8841b189e82d20151839f9e7df83414
font_01_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFA 11024 bytes
SHA-256: 31d7133c919dd61b67cb57451321664c01e79ccfd0134194d83951a32fb86dba

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