Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4811b5003e8b19…

MALICIOUS

PDF

76.4 KB Created: 2021-06-27 07:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c88047d5af8b21bef30f91d417a0e3f SHA-1: 5b146b4d6d4648948966c6b38b1873289a194637 SHA-256: 0c4811b5003e8b19b04c5e2f51b512bdb4a0b6b6f43a352891d5e1cd09ed3457
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, many of which are hosted on disposable domains. This behavior is indicative of a phishing or malware distribution scheme, where users are lured to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/4ff13b5398d5df4c965e9b25570399aa/kulinurilon.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16075263801eab---67396126071.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8b601495faad107dd1656696b3ec6ae4/87466034330.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/2429476873.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7eoe36unme53g5aqqpvegrdpvn/lifudavelobawobekokilago.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/asr7sdh1ersi3ml4mt85tv7vs9/pujetelufa.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6ca826e4dec2ea327aa3ec049aa1e623/sijugidaz.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/9b1b066c2282658d708709e35bc16b48/51002790117.pdf
    • http://md-servicios.com/userfiles/file/kumoke.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/4pmkk8rmluimcqm28rcg4h5k75/volaxuluxuwudubamororu.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092f112f3388---xosozozu.pdf
    • http://k-souz.com/userfiles/file/62930845824.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fu48fut2c3n3o7pr6ovjcqivsd/kawekedemajibopit.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1df1dda20d---gemuvapetikuwed.pdf
    • https://ltssinternational.com/res/wysiwyg/file/21681972338.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987e24a81b4---68038231562.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/350d5787678a0ebab39b7ea4e6e692a5/nekigarakapitifarum.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/87461861492.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1deb460b16---32628204015.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ap8gsrje5k6tnklj2tisju88v4/85106461632.pdf
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/7264861121.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c9609de7a65---93975440820.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96d600f70---20535568593.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17e9170cda---bifubegukawilatatap.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=that+was+amazing
    • 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_off0000c90f.bin
96083102e31c4fa1d5f21454d423887a72d92093ab6976f257387b2d3796caa5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 17920 bytes
font_01_sfnt_off0000f559.bin
d90b64b3a371700ae4201ec3396c9a6e92556de9f3933b41755aef1cc2b310ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 10264 bytes
font_02_sfnt_off00010c4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 16792 bytes