Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33633fca2e18c62…

MALICIOUS

PDF

78.9 KB Created: 2021-06-28 06:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8895e093a7d0a626128b003a2410ef88 SHA-1: 8c8ee7f9ed06597edf394a3f5fd8712586360e90 SHA-256: d33633fca2e18c62b8db1c843221b82abba971e59da012d94e8f474a630802b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, which in turn host other malicious PDFs. The presence of external URIs and link farm heuristics indicates a distribution mechanism for further malicious content, likely aiming to phish credentials or deliver additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba46c5b34bf---pajuvaberokojejanan.pdf In PDF document text
    • http://artecgroupservices.com/imagenes/file/56609805265.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/supozomudebidif.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/lo1b56g9a613haebn4o0eimj0l/fejabewetubav.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/9039g33pj4kn1n31qlv11vqalo/fafugar.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/luvozigivakuzakemugizu.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/ladupofikarexabida.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/nedetijejunidugakevoloxon.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/57391632347.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/7c531b1abbc5e67551ca0442621e9bda/87022128938.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/3b60106cb4f08aa7c1540043482a8069/61922891129.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c905f533fd---biwurifiwagubanuwoxep.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/merak.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/manepaxixivutibakokare.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf901d697b---75037733745.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/0c4ef3dea287b7db4c59299497c8c8cc/63153818985.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822b12e0fc3---8338250534.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb2af44d3f---lotuzurizadakikiwete.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f8c364ba80d03d6efe72a7e9feda06b0/budipiw.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/kulazidepovugupo.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/46010525071.pdfIn PDF document text
    • http://industrialdevices.in/uploads/42110205010.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0dece728---fagolakuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+many+cars+can+you+sell+in+gta+5PDF 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_off0000d030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD030 10996 bytes
SHA-256: 132c0e8dd976235df3c08696a116d0f0324f6b1a0e2f4a075956b73ef1553c52
font_01_sfnt_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 16412 bytes
SHA-256: aee8d902ad27a2bcb9642d42b4e9782b1c240b0f0ee84e2b0781332d94e7e5d4

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