Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7b56925c7be1fb…

MALICIOUS

PDF

77.9 KB Created: 2021-09-20 03:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ebd2da81ad9e6efad487941fd8d5fdb SHA-1: 6fc941bf6b59ec984697a0486be2dac1de3ff87a SHA-256: bf7b56925c7be1fbf407ea7adf24ad698ad99d14c5e776be708b3f21d94bd3e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://krisoc.ru/uplcv?utm_term=the+nervous+system+is+divided+into PDF link annotation
    • http://danguykhoidoanhnghiephp.vn/Upload/files/77972005777.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/dusogoriruvojukej.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130c810e896b---33940025316.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/wegulikuxosipewiwo.pdfIn PDF document text
    • https://tuinvandecruys.be/file/23869680219.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/fisaguduj.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/4885635033.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5d672278eafea2cbd9df6eac5b655a69/saredisaman.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/e6540jch3e83di2328eo4eomav/nixuwemevufeviw.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/2733042006.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/74043060863.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/xoxapodiku.pdfIn PDF document text
    • http://videocycling.info/files/file/wudit.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/97937783674.pdfIn PDF document text
    • https://goodline.by/userfiles/file/luvosarekijimulutes.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/89894609666.pdfIn PDF document text
    • https://network-italia.it/file/28518604692.pdfIn PDF document text
    • https://fratellifurloni.it/file/papomovozomes.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/zeveji.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/81987028954.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/fakuzikolaxuvoneboxedo.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64125913855.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/u74ta5qa7fca63q7g3qvqm8791/defozaras.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/givazatefa.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/mawamaratojonovasew.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb644873f---76131806500.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_off0000d02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02D 10548 bytes
SHA-256: 33b18705ab3fe5de9e47d34e3beb5242c838a0c18857ade354be57063baa2b7a
font_01_sfnt_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 16260 bytes
SHA-256: bf30095e579c4ab222f179a96d8f8c8809d554d0cfc4a900b2653e2da603097c
font_02_sfnt_off000111e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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