Malicious PDF — malware analysis report

Static analysis result for SHA-256 b801d72f0856d10b…

MALICIOUS

PDF

94.5 KB Created: 2021-06-25 19:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74bb5b6b52a20316f3c896c0aa283d3a SHA-1: 265690fc95b53048ee30f2bc1517eb2b92039011 SHA-256: b801d72f0856d10bc83ac4c3f485535106f2be254a6724856b0c673ef19f39d0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories and disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/55c349190a463f371d7100a579bed8b4/86248685179.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608703e9dbec4---powixir.pdf
    • http://a-mega.ua/images/uploads/file/92669935973.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/48535619022.pdf
    • http://alpha-th.com/userfiles/file/gefurivorafoxoverugu.pdf
    • https://meganimal.pt/site/upload/file/11005377813.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1vjjf2nidqcnbki9rbeh7ogqdt/xupibitasasibufimu.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2f7452f07d081b1cf1ca9f3fa8cf2ea4/gofexaxerufu.pdf
    • http://chieucoingason.vn/files/lowevegarixulurusa.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfaa70e466---64265574882.pdf
    • http://3qbuy.com/CKEdit/upload/files/2628596059.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812615d6627---mamotava.pdf
    • http://littlepearlbooks.in/data/eimages/file/16002681361.pdf
    • http://ahkjt.com/upfile/file/26130552311.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/poxipipefagugonatux.pdf
    • http://divorce-difficile.fr/userfiles/file/latarinorojixipawabisalep.pdf
    • http://momsystem.ru/public/file/33659006642.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/of7fh1qqi3ldj2n8o4si2vs9k1/dezejuzojatoge.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe89a3c11e---masexijeferipiroxowex.pdf
    • http://riversedgefm.com/files/file/sisajif.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/32575152262.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/751c83e9ab7152dfafd4eb3f298e100f/5543865264.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091478a4c030---69369502361.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee972554d---70540750219.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/1ec2e6c307c4b1fc228a9ab2f4841d51/worodogaruridewesutuno.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cb2429e2a---jibizafugevimozib.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e9e45d80e---39298186420.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+make+someone+fall+in+love+with+you+in+chat
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 16792 bytes
font_01_sfnt_off00010eee.bin
44ef3a7064348bebbc1b4f8cdff0a25a0d2a234656df01dce93ad822e9eb76a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 16916 bytes
font_02_sfnt_off00013a8d.bin
14373b3f6d787c682c0094db7eae96d3fe7f73e85612f95cc6851ba1269bde16
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8D 10952 bytes
font_03_sfnt_off000153cb.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x153CB 16312 bytes