Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58fea73e0fb51c7…

MALICIOUS

PDF

85.0 KB Created: 2021-07-06 03:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea054c75940896594fb76c4137a2ee83 SHA-1: e77e99699a1d54db04b1af777c2aa296006e5d3d SHA-256: c58fea73e0fb51c745c454814f3e346b520fc092fad728c389bdafd419b5d5a9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites, suggesting an attempt to host malicious content or phishing lures. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c39e4858644---wusoj.pdf
    • http://www.gonouvellezelande.com/files/nozaxomepabegilidukud.pdf
    • http://morethancars.nl/uploads/edytor/file/55210140398.pdf
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/c07b09bcfb388e5d365c203426030a5e/fokes.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/5cmoi8cr2ta7m6csjlu6jc5n55/loxotozuwo.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160980516b2afc---73758319796.pdf
    • http://aygroupmuh.com/image/files/wotufibavanuzomif.pdf
    • http://duancanhotot.com/upload/files/kadebatok.pdf
    • https://implant-drill.com/userfiles/file/59348197859.pdf
    • http://ergo-logo-bamberg.de/userfiles/file/muvobikobolobu.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/28efc4977c8ba013f6059303af8f7ca7/88184141919.pdf
    • http://ahchala.com/img/file/fekezibapokovopinezup.pdf
    • http://travelshops.pl/userfiles/file/51360512339.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e7cc2785d---67085075024.pdf
    • http://tara77.com/clients/46590/File/4451416870.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078310d4349b---53740824218.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fe688bd6e---28331092026.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/5a235081820023cec61aa46dcd3704a8/20205733674.pdf
    • https://nikosdimos.gr/userfiles/file/vamixugogafupaximefaguna.pdf
    • https://cornwallstaffagency.com/userfiles/file/94336623741.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd507ccf92---gevalazazasomupimuwaket.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c46a7857359---xedujalokoronafenus.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3b2aa8a7e471499270e24f901c13afd7/77355189320.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=observational+research+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_off0000ea14.bin
10d8e196a1017c4fe6418cc8601b71a9b5d2f0b37a8fad9253349dda8b84e24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 16952 bytes
font_01_sfnt_off000115f0.bin
c2e6e492b7c3e31577b0589062b29ac76c7cf5466ebdeadc5695b36deede4702
pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 10948 bytes
font_02_sfnt_off00012f15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F15 16792 bytes