Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9bd72d26118463…

MALICIOUS

PDF

75.6 KB Created: 2021-09-07 13:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c4cb14b54b76b61dd07849a26c1a15b SHA-1: 1618c5836d3e85e87de45db3af631563aa41c1d9 SHA-256: cf9bd72d26118463a9c1ceee0e2a733bc1050cc8979a719ecc7f28a10fc9b901
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mutamobilya.com/images_upload/files/vifujixem.pdf In PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a77bea98844---74789057619.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4a709c2fd4c69aa89cbf6d28784205e1/tivajixigujoriw.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/49362413591.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/fifufigipanaf.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/45790078262.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2c283a0f---86253250818.pdfIn PDF document text
    • http://mientrungpetrohotel.com/users/files/24260100959.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798b0ef2f68---23211421117.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/eabb1ae3081ea5def25a297e66bb8365/59964208057.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/pebelopifarofilakubama.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/voborodej.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/fezut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d30cbfe5---96446237760.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/kunesogunazagijikise.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/9858h7j5vuf680ngqr73muc9cg/dabolisawumozibiritakib.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/d781aa6547ab616274492f33d9b78526/lokoboxatukamibel.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/5789cf9e3504363f37453fe74ca5bfec/vilozalajujuxobu.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/71841816997.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/wageralomufijubazaxedise.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/musifeneremotusenike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hairspray+2007+movie+script+pdfPDF 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_off0000bd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD516 18968 bytes
SHA-256: fc01ed3c1b781c9a25e179bb4707e571a7b907d4fb9cd42ea789e308d96bee71
font_02_sfnt_off00010579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10579 11096 bytes
SHA-256: 41309d09abf34e1a71635493b15da79e2156c86bbb1d5864a5e6f3c72b87a238

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