Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce2d713c152ebd2…

MALICIOUS

PDF

69.1 KB Created: 2021-09-05 19:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4ba15ebc4bd540d6c6ea01021d97adc9 SHA-1: 21d61954e91f331913a5f53c1413575963280efa SHA-256: dce2d713c152ebd2b304b5bd01457b2422300c1d72d44711a20c176d298d547f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The presence of link farms on potentially compromised CMS platforms suggests an attempt to obscure the ultimate destination and leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864c981b395---36704834387.pdf In PDF document text
    • https://drlanda.hu/user/file/surekigulejepanomalutamo.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/bemab.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/piterazopak.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/978c6e00b5f9d60fe64eb80ca1c0adf3/27151061707.pdfIn PDF document text
    • https://scriptdd.com/_file/file/35438454313.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e8dd70e7b---ziwowob.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/xoleb.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/bt9gcg1tuisns6rbgptndo48q8/musakewotirisezufaj.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/f15533b78bcfe6a54c99cb502beb4d2b/kisinexakobuvunilibag.pdfIn PDF document text
    • https://ubitanduk.com/contents//files/90149547317.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/40965469673.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965de835e36---nitivutolumapumaxex.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/60175761935.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1orbmmn1r3q48lqknvdbu2shvr/deruv.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/nudezagirosano.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbd44e9b401650b03076b945f92d426c/80176008845.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/74390007265.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16094abb086afe---98704971875.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/53048245178.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/30255386499.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ac1e32f02483b35b130e3e9c495c4fd0/62524815215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tone+middle+school+worksheetsPDF 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_off0000b20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20D 14756 bytes
SHA-256: 011e3c3e0906c975e0c3555c9f63c50986c8da6e81c09c1fa22a9378e85e77da
font_01_sfnt_off0000d6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FD 10612 bytes
SHA-256: 28e25c61dbb33fba4bb2a1a6563c886e37ac11bdd80f32d63b60de91b85ca359
font_02_sfnt_off0000ef16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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