Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b7da5222c7d2e6…

MALICIOUS

PDF

89.4 KB Created: 2021-09-05 13:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5caf18b44128e32344b4b10f27816d56 SHA-1: 485069542c2fad065665e0af587870dc390d85cf SHA-256: 87b7da5222c7d2e6fac84dc073a7363d544bc1f4f530fdc7b7754c41bb996871
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external websites, many hosted on compromised WordPress sites or disposable domains. The primary purpose appears to be redirecting users to potentially malicious content, such as phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=trastornos+de+la+percepcion+auditiva+pdf PDF link annotation
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/vi4ebthkabcvrngsljdi19snig/11560145983.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/labep.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/24850030141.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/lufidizodexudofiz.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/rimumefugomilivedovimanep.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/c471348033f1967a5215f43948cec1e0/39450676573.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ad23ae54---24083820087.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/xodenibinoxujax.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/7523771914.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/0ac57e9caac179f8fe8935010fde32ff/zisubarufudowifop.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/9760b4531c087d081ebb8612edfe309f/didopi.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3784b362e8---50010500379.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/d8eb000febdf8fa68345f0875b505465/88171221872.pdfIn PDF document text
    • http://hoctienganh123.net/upload/files/dazosukuwil.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/44364252669.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/gojuko.pdfIn PDF document text
    • https://denimder.org/resimler/files/63006987557.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tloubc0po8iq7fbpq2utted1j5/2001206225.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/08f5283c96d9f8324719f9c5361fed34/zitabole.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/83642128005.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/51363187847.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/128cf65a553e407a825a221ecbeeef25/nuzesidibabexuxigefajal.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad4a987d0b---wokapixiwarosuk.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_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 20192 bytes
SHA-256: fe1984b674eba2f3092e138bb83fa1e6d2e19fa8f67fbd586fd555ffd058eeea
font_01_sfnt_off000124cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CD 10744 bytes
SHA-256: 215d47f4d45a6ac84d236df84fd1fdda40337df4ab24a626bb117c890316fb89
font_02_sfnt_off00013da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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