Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40dbc87a28dd49f…

MALICIOUS

PDF

83.5 KB Created: 2021-06-26 06:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff2254ce5b654cc14033333df36addfb SHA-1: d40c0a8c6d98d1e998ae1d4e6f2ce32a3e66a49d SHA-256: c40dbc87a28dd49f1e5cf8b8db74ed7fa6f8c4a9cf5e49383869252baa3e3c7c
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://mclandpin.com/calisma2/files/uploads/32306616133.pdf
    • http://duszek-lasu.pl/userfiles/file/vexapibawu.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a45d5885230---fizipabagodupajox.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741e492899f---10632830594.pdf
    • https://flardochform.se/userfiles/file/maxaribunejozekeluj.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/tjd4tt9ab89e2r5pde5pkhsn2a/85516813384.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988440a409f---30813283071.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6dd51865f---56639725287.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/0b40e8c19b31d9256479534a59b886a4/kosekomoz.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076b55d393c2---vobukipiximazapaxox.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb961f1823b---nitotanajunajobogafa.pdf
    • http://goldenpoolandsauna.com/user_img/files/kepulakakatewovop.pdf
    • http://castrolmintabolt.hu/images/upload/file/81290047141.pdf
    • http://st-ark.it/userfiles/files/muwoben.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/e5fbbd8c3f0b60d1f0d16d650d20a741/godokufopa.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/3989ff5afd2ea283731e473d627e97fd/runafa.pdf
    • http://alnoorcity.com/userfiles/file/mariko.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mokocpm0l1bnro3s989vkb66jv/lazakatoxe.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/28630129956.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e5f10c1079108ae518653245f7de5cf2/88674619639.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/pusepasafejipomexivalaw.pdf
    • http://odpadykj.cz/UserFiles/File/42055354967.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c536dcad5---vapibomebojonizufogejok.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/7d6a0a9819789a015fb60b395b730ea9/54179029484.pdf
    • https://pima-alarms.rs/slicice/file/gowukob.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=can+you+mix+enamel+and+acrylic+paint
    • 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_off0000e3b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 16792 bytes
font_01_sfnt_off0000fbc7.bin
3a07dc1cce5bfb64350c62c35054b08a9617829de8a358fdc3a31e55c8ad690f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 10856 bytes
font_02_sfnt_off000114d7.bin
87b4262c8601b538ed777dca67b7a3a72ade2de2d545b2b5e416e29bc8e7052c
pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 17136 bytes