Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa44fc1ef7b5b6a8…

MALICIOUS

PDF

98.0 KB Created: 2021-06-29 20:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b3ebbc36e7ff8b0caefc3f90f93877c SHA-1: 3308bfe09cf8e2ae8fbb91b2c8d5333a679e9e25 SHA-256: fa44fc1ef7b5b6a8661090f820d6994ba57c82ed6ef6e7b88882e8aeb40560a9
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with many links pointing to compromised WordPress upload directories. The document body is unreadable, but the presence of numerous links to potentially malicious content suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b1ca44907c2ca156521aa0355c3ebc4f/zobedagalabenanobobu.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a530ce531f---pakuxavewawitogifuw.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a27cf3cd4f0---vapeletepit.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16076906f448d4---baguronetapijamugepa.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/suxekabebit.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ovev9m4hi61t0jodprjc4294l1/zadalopubewewol.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/de4341bc206d915871514d6b4e851cc3/26805264641.pdf
    • https://actor-conseil.com/files/file/47175089360.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eee224b8b6---93227855292.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096c42d5321f---89159631129.pdf
    • http://animalscipublisher.com/files/upfiles/file/fuzotevuluven.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce1848a018---53957275487.pdf
    • http://yonseri.org/userfiles/files/foxapinavuxigude.pdf
    • http://beachhigh65.com/clients/879402/File/tefamiwinapu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846ea4457d6---bigawixogifalebuvuwabobu.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c72afe6ef241d6cc0090f928009ecdc1/63256983729.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/8404788527.pdf
    • http://hiddenforrest.net/clients/76790/File/dufexugakuluzipedebuf.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/48951017275.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/cde75ac44b8bd7fb1f89163def5762b8/novolu.pdf
    • http://robalton.es/Albums/images/file///fidirunakazibedotuzomowu.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/bce144f7b7cfa2fb351e4e83a21e5e86/82597042084.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/30de52f6a64e52a07beeccb7c2390949/lubavo.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda81d1ced3---lurekibogizijenubufomix.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/4080ffcbe32b3ff5f1ee71ec2110e235/42344467001.pdf
    • http://sanga.asia/userData/board/file/zoriguzadixugafifuv.pdf
    • https://telenovella-bg.com/files/80314785426.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+dry+adiabatic+lapse+rate
    • 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_off00011925.bin
be7e4cfa7fee3c67f07c49b6c858c51469844e00bc4e40a57e9c59b62143b320		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 10604 bytes
font_01_sfnt_off00013140.bin
1e85e8c795ee696fb30a7a8f9a462329dbc065997163bc06133bb969ba56b34f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13140 17920 bytes
font_02_sfnt_off000160b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160B5 16792 bytes

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