Malicious PDF — malware analysis report

Static analysis result for SHA-256 175cb6427410abea…

MALICIOUS

PDF

86.7 KB Created: 2021-08-06 19:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 71582d2b369c0e69e15a0112e72d18c5 SHA-1: 49ff5ac04f88bbc104fb659d632b8a975b83719c SHA-256: 175cb6427410abeab593b05f94d06fb0334214fa61f81cbb051f7910f8a37633
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised or disposable domains. This pattern is commonly used to distribute phishing content or redirect users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mid-europe-ex.com/images/blog//file/wojuzepejevab.pdf In PDF document text
    • http://mesterek.net/tmp/gotugoxelonipaxog.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f8959a5cf244d60e7f9e12926569ea90/78588233805.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/40880825b4b3a17316c980923b6b8130/papaxuko.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/52754927653.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/sogisivojeg.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/fixevubewog.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/be3kea238fng3qvq49va4vsguf/71234944169.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/7340386014.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/lotazenoxuletunotezesaduj.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bff81b046ac---83654681709.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afe71b67b5a---xavovije.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/61435781962.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ebc5ef031f3fcfa8e86cfe0b0b2b71f6/wewitovaf.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c67609c152a---mapugemizubasibi.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/ritenagumud.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/ravufajawivebikosu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c5616eeb415---jesugotap.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/latawatugujakafubixexaw.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/48382007992.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/74d2237ec507504f6fd18574f20b1bf4/19522758499.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160874dadc1af8---1959593850.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b753088533---tepig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ora%C3%A7%C3%B5es+subordinadas+adverbiais+reduzidas+exerciciosPDF 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_off0000ea05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 11132 bytes
SHA-256: 8727e8638b618ab09cf72d33d2af2b33e1c0f9077283b5a046529078fa92a707
font_01_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 18720 bytes
SHA-256: 09fb33849c4607613c59f6a441c05c17e6d7fac41fcf77162885d4dab144af17
font_02_sfnt_off000131c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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