Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aca4d9bad828ce1…

MALICIOUS

PDF

100.0 KB Created: 2021-06-28 11:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b04728fee190e9fde0e706d9a7cfcc64 SHA-1: 1b7cc474818c15157767d77ea99bf00886248292 SHA-256: 2aca4d9bad828ce135522e5e5a74be6ad13c6726133228bfdcd6e649c661f5ea
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs are likely part of this scheme to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c48a95a36c5---xepobelilisapimuxezurasu.pdf
    • http://www.look4job.gr/images/_user_na/file/56585996951.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/50546b6d2ea4951a1a419c7f46a460db/tekuxagal.pdf
    • http://hitecds.com/userfiles/file/sogokasubokodagejobum.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/a67e5021b40b93eb874dcc351476b123/bereramalevekajerusi.pdf
    • https://atl-50.com/files/file/ruwezuxabusamazoxe.pdf
    • http://ipmarketing.net/userfiles/file/bawugesutikozesajefi.pdf
    • http://ats-dz.com/userfiles/file/xafizojutejizofanaparabi.pdf
    • http://armanetti.com/images/fedilozi.pdf
    • https://chiuman-hk.com/images/file/66197416793.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a13e579f0---47107778038.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8c252d176---witasonipixu.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/9264033737.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd8105ef0---6377925968.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607afc8031be6---41818544103.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59943be330---43522363978.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087538822983---3128122594.pdf
    • https://diaochue.vn/userfiles/file/zugazutidiwow.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/77a1dacc2283792a5ac6a54487f269be/10505090927.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873eded0a25---98527950878.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e44e25151d---21968608786.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d856133f9223f5bec2218f9c37f7462e/meluwimitolilexo.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/caqf9ieukuvke1n928ld08pdmh/bimufipezito.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=2+tens+and+10+ones
    • 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_off0001250e.bin
0c8d1619b41a0e14472b4eaed81926c0acab8034a5463b93d2bbf929c2f5696d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1250E 17996 bytes
font_01_sfnt_off000153e7.bin
3a00af8cb2a194f386e3b6f2bd344972cbb3a8c282c0cacc96c8b73e23bd6b86
pdf-font-stream PDF embedded font (sfnt) at offset 0x153E7 10200 bytes
font_02_sfnt_off00016aff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16AFF 16792 bytes