Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3cb9dc0e59b5f3…

MALICIOUS

PDF

89.3 KB Created: 2021-07-05 08:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b15d8ed9f9452df6464ba56950866236 SHA-1: 2b59a5a298bbe2448473fd4b23e70eee157233bc SHA-256: 6a3cb9dc0e59b5f319ba7dfac3aa1cec0fa1654bf6080d27c61cc7d8659cfa3c
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=realize+your+potential+meaning PDF link annotation
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/elkrbi4cj95ue4ti1umjilbos0/butij.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/63ik9lso394oknrc5vsp4vnpp7/27753642448.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e28817404b1---gomirolikefageri.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc14506177---mowujodovavi.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/adaba97ba5a21efdfe32fb6ace0b34e1/satopijuk.pdfIn PDF document text
    • http://ipceurope.com/assets/file/nosepalamapifolade.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b245f15c727---detemujobetiwobifalifusib.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/wogujefagij.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/5530779528.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/japavafazizo.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/6u7uo53u2ea77859c0q4rjfsj5/49537803059.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a28b4c4f4f0---kutagenewigemivifupifo.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d6300418b---dugabepojabezifoj.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/949a925ebc3df9d8380386984e5f368b.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7366f24af---towopuxamarufetip.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/a6b6831514b172dd1676660d40eb8f47/vodozewomegarux.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/sakori.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/22684230136.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/gipimegelukexukizexet.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e35529c0474737a280b845e356aaa914/mifoxufomolisitisazevete.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/9206687848.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/0s44ahm5m9e98n2c4urj1cjcv1/dumazov.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/e1qcbslevmql0p0tsv50i0khrr/7655913749.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/11632467650.pdfIn PDF document text
    • 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_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 10744 bytes
SHA-256: 452f8d6d1b9502d23ae98d4acdbf7dba1015b4f442380b0c56747ce9a30bd0b9
font_01_sfnt_off000112b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B9 16760 bytes
SHA-256: 21c8c3e904fc504517897675f4b4e97d36d3f65caf65ba4a11bc02faa609f912
font_02_sfnt_off00013e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1