Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23a8a2290e8709c…

MALICIOUS

PDF

88.5 KB Created: 2021-07-01 09:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e41b6c1abf971fce02691b0271b72276 SHA-1: 18fddc36d67eb67fe4a69e0e4d325004842a65eb SHA-256: a23a8a2290e8709c643a9b5d1c9cb012a7693e297f7410f67335f897f4ee5380
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress installations or disposable domains. The embedded URLs suggest a phishing or scam-related lure, aiming to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=labor+rate+variance+calculator
    • https://discoverthesky.it/file/92027866940.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ea4dbc4603c4c7e3a7185de451934340/69648239145.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e675d04b8e---33682921612.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f37d8d348---42646367001.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/682ec0703937eabb2d7d49268ffbff5b/45436245173.pdf
    • http://elsekmont.eu/userfiles/file/65572340205.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/sakifipita.pdf
    • https://emmaushuis.org/pages/38554805468.pdf
    • https://podereilmontaleo.it/writable/public/userfiles/file/jotumabifab.pdf
    • https://socohoteldanang.com/uploads/image/files/pajunijere.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/12f9555891388f0f9e776704e566e95b/rilufokeja.pdf
    • http://dongfangguohua.com/ckfinder/userfiles/files/17761615474.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec249d4522---638726148.pdf
    • http://fvv-hohenfelde.de/sites/default/files/files/supaxaxaved.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/281695da8154226b7187106fb5d8e632/54342827502.pdf
    • https://coil.hk/upload/files/ralor.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b5f3a9b97d17543f3166eed023ab51df/xuxeletanefotisidino.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c409ac904c3321e63876569a9685563a/novejubiwes.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/d138i6o83g9go1n31vnvk6gemq/libimebogefumo.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd4144280---nesesofikewopifalezibonez.pdf
    • http://www.ecostroyservis.ru/File/99595611359.pdf
    • http://ajisushionline.com/uploads/files/zajizujusirunaw.pdf
    • http://mbcasc.net/imgs/file/jevegona.pdf
    • https://scriptdd.com/_file/file/81739953237.pdf
    • http://www.aportecnica.com/imagenes/editor/file/22713047662.pdf
    • 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_off0000f880.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 16792 bytes
font_01_sfnt_off00011092.bin
df8c7662e75bd6483b8f0e3451cb8d7e9b7398c839cc2b1377e91fb34da8a514
pdf-font-stream PDF embedded font (sfnt) at offset 0x11092 17096 bytes
font_02_sfnt_off00013d39.bin
09d9c56fe22d130ca7bee1be3d6888e19077a714ac95b56a8a4711997c152703
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D39 10316 bytes