Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32728c49e62d2c3…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 13:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37291258eb9550c7de6bcec0b2a26774 SHA-1: 366ab7983dd22590278713d66cedff1975749eb8 SHA-256: c32728c49e62d2c32d9a7096113ec6ff13a62f8a67af8467dbea871e6e523f13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely to distribute further malware or conduct phishing. The embedded URLs suggest an attempt to disguise malicious content or redirect users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=calendario+2018+pdf+por+mes PDF link annotation
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/1f0c1375850ce54aea791c61801fefe9/90130742961.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/6h998rn59hdtjt1pm8bo0l3gos/10514285293.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/lodanopovabexitijodi.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076085735e41---52040844934.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607432d23a27b---33478130865.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/vakoga.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae9250e75---6554423442.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/arq8242t40tlh5nb3vbq06oj7c/fesiluwodum.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/rozifa.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/62857815911.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/19htfr1vobeme6i4cisg3jktb8/65851825802.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cc18c6e40f6---74405907271.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/sufuba.pdfIn PDF document text
    • http://iphysiology.ru/upload/88957771094.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/32186965247.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/47900047619.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/toxujogugi.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/16aed5fd30e13c5c03ab7ed8bfc6cde1/pavosuzarewirewipalabudi.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/34b0f0040d1d8f75dc92dd4d347a9ba5/kelibubojenagek.pdfIn PDF document text
    • http://mebco.ru/images/file/mirawagedaruvew.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/57420346842.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/kipevowilipobalen.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/869ccdd6b3bd3765f2033003b5777186/24959594286.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/47713576022.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_off0000cee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE5 18900 bytes
SHA-256: fd24573c5c6a5562464a63af2d598ce6aa9ded2d923a09a632e63f37b4a93e9f
font_01_sfnt_off0000fec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DC 11092 bytes
SHA-256: 70ac32f9cb9415887284c8c3ca95ed528fa317fdc69f94680f8b1bbcd8aaa14c

Open this report in the interactive analyzer, or submit your own file for analysis.