Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a81fe33eef9ea2…

MALICIOUS

PDF

90.4 KB Created: 2021-06-29 03:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6269b9a4284e3be628c0bd6fd29b904 SHA-1: 79834f5bb35a8f675ae546231ebf888d7be76ee2 SHA-256: 13a81fe33eef9ea2f9aed0bb6fa95344c7681e38c4ab4a2a9142af950b26f01a
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting domains. The primary purpose appears to be directing users to external, potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mdfgiare.com/upload/files/72780665510.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/5330620e9f9cc8be5eb536ff8aeeaca4/81226866994.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959378946c5---46527828837.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/da364d77cbb78f7c6579902253dd8234/ziguzoseboxunol.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/87e9f3dc901837923c647f829e8e5999/gasanoretagemiwamaja.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/07b9d5667aca95b2f1718189e7314fb8/80950302339.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078f7cd5e542---vapujadewapixofirez.pdf
    • http://duepassidalcentro.it/userfiles/files/31312833833.pdf
    • http://www.hussco-steel.com/husscofiles/files/napibadut.pdf
    • http://anthonyvienna.com/sites/default/files/file/womarin.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/4e9b4b8bac026afa3624f1e4624b1d24/winiz.pdf
    • http://acpiindia.com/userfiles/file/pedilidu.pdf
    • http://zeroseistudio.eu/userfiles/files/7625283356.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081ce4494bac---wumezavep.pdf
    • http://nextgt.eu/uploads/file/62517360655.pdf
    • http://aelma.com/sites/default/userfiles/file/rivuwu.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e269710fe---54009567445.pdf
    • https://antae.be/app/webroot/uploads/file/podelavaxezojaw.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a38083cbebc---zokuzafimederekakijuriw.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960f4d391d0---rinifugugom.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46152a2017---75573556258.pdf
    • http://akinmedical.com/uploads/file/39826694162.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/51306058323.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e36a5ce8b---tuwefe.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/300f3998684faea17076033cd3af3968/62526410601.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=katz+lindell+introduction+to+modern+cryptography
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbcf.bin
effd1f4a5187236856199f33445f821823dad79af606f0a25c4958f43a6a3822
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCF 11060 bytes
font_01_sfnt_off0001152c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1152C 16792 bytes
font_02_sfnt_off00012d3e.bin
70cfc6aba329d7315267b66d59aaa0fb307fedc978737968c5dc0d8c78315b36
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3E 17852 bytes