Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d573245de0c8114…

MALICIOUS

PDF

86.1 KB Created: 2021-06-26 20:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f0c171b4291ad8b6f5dc392ef89bc05 SHA-1: ef00bd04f2311633d6cc3723af097bc9c9f9a468 SHA-256: 3d573245de0c81147e0073e27258d484d0ca56f1f8e0bdd4f56990b5d334e4f6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

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 http://smartpaintingplus.com/userfiles/files/25079311507.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ht2t68f9n1fubm7j82qfqg6qf5/walisevepamiketobakas.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-20/20210520074238609642.pdf
    • http://stpatricksreunion.org/clients/84553/File/giwanubebipo.pdf
    • https://babamore.com/upload/ckfinder_temp/files/20210605084130.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3093591cbe---nimodujatatavewin.pdf
    • http://kiuanai.com/userfiles/file/dofutapo.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nphgheml9m5slics0vl555uvr1/35823933527.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/fvg6k34uhqu215uebmk20c7ga2/pilazozanekunapulisana.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/45bsthcsdm5dr9at1aoqa857p1/74932186303.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/5bd2291c171d04293622b5cd158a832a/sojutu.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082da4fe8117---69992100893.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/c1e3fd1a04fb416a4ecb890071953bda/doxozoduguditewejur.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f6194b5fc526031c1480c9748cb2832d/425185217.pdf
    • https://aartipalette.com/userfiles/file/puvipetijek.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/msodca9pqbvr2u20uqv89tu9ai/nikixotebimobamu.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/f967731bed66d0db44979d74819de80f/31118186980.pdf
    • http://bogelaipigeon.com/upload/file/2838277149.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086c6d7685a2---84689609881.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ngotf3jmun62u2b9ug5ibhvm7l/38155445890.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072ebd2a817c---54454484090.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5d2da3bc3---niwomolifojujapezu.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8a4a6cc8cd4b76980689a5197a0e8bab/47169315392.pdf
    • https://hogies.com/includes/template/uploads/file/tirivutabapigix.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+can+i+hex+someone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede6.bin
dbbfa57be1f1bb7f79111069772d2d0eef9bd2e597caf51d9683aab3e4a7610e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 10432 bytes
font_01_sfnt_off0001055e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 16792 bytes
font_02_sfnt_off00011d70.bin
63952762146c8ce7d300e56272a0ffb519f2bf5879a2d98cd3dd1872da482e92
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D70 17676 bytes