Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44dcb80774cc3fc…

MALICIOUS

PDF

71.5 KB Created: 2021-09-13 23:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9004c09d2886eab6237aea02ba15a6a1 SHA-1: 28be2cf1eae212e7e9a8a21141b3c313d1ff7705 SHA-256: a44dcb80774cc3fc3a3d953b4af62db690ee02f967ff6686433db5dda4b1cab3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised CMS platforms. ClamAV and ML classifiers have identified this file as malicious, specifically a phishing trojan. The primary attack pattern involves luring users to click on links that lead to potentially harmful content or further exploitation.

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 https://dananeye.com/uploads/files/202108312331029734.pdf
    • http://1utilaje.ro/mm/file/85390494441.pdf
    • https://dadesigning.com/daduserfiles/files/35783993606.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1751b5b7186e5ee6a8da4510a3b3e562/36110307845.pdf
    • http://morgancountyoh.com/userimages/sonixepi.pdf
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/46021734901.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/olmvnsins97v97mskf3a48f740/52174223433.pdf
    • http://jocoseatee.com/userfiles/files/depimalezudemev.pdf
    • http://classicalgardenfountains.com/uplds/file/65757890728.pdf
    • https://aspit.ro/imagini_ws/78000001369.pdf
    • http://cdseoulps.com/uploadfile/fckeditor/file/panujig.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dad76c128---9697511550.pdf
    • http://www.impactit.in/ckfinder/userfiles/files/58368154162.pdf
    • https://pmms-online.com/assets/file/noliledimanowibegadera.pdf
    • http://gzbaosui.com/uploadfile/files/11104433761.pdf
    • http://builderall.info/userfiles/file/sazariwotavuwirujamin.pdf
    • http://anpo.vn/upload/files/ronejaxilusaxo.pdf
    • http://poultech.net/d/files/63677797765.pdf
    • http://oaklandscreche.ie/userfiles/files/xutodaz.pdf
    • http://studioferrato.it/userfiles/files/75118556159.pdf
    • https://sanagustin.cl/files/19694381130.pdf
    • https://drhuanghair.com/uploads/files/202109010756541174.pdf
    • https://hattshopping.com/admin/assets/images/ckfiles/dipejuno.pdf
    • http://midesignvn.com/uploads/files/zuwubewirus.pdf
    • http://factorycontrolprojects.com/userfiles/file/4939211239.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=defense+io+games
    • 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_off0000b5c4.bin
19228f73435782405fc0061c7d3839b40d190cd5481bf41f7b20a053fbfdda90
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C4 10316 bytes
font_01_sfnt_off0000cd03.bin
6f9768bdb548fd1470fa9ed109ce1dd731ab91301360519fef90ad2dd77c9174
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD03 16876 bytes
font_02_sfnt_off0000f8cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 16792 bytes