Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73465ec28a83abc…

MALICIOUS

PDF

80.6 KB Created: 2021-08-01 04:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2b3a37290e8c6da525f05ddcca811eb6 SHA-1: 6e35ae6b6f9a07ed0fd16f38bd30dc14b7662e95 SHA-256: d73465ec28a83abcf43211c90782fab94383dfdd0bbd16808aa68e9eb831314f
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to potentially harmful external sites via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://archism.ru/uplcv?utm_term=a+kwela+for+caitlin+sheet+music PDF link annotation
    • http://jshtextile.com/UserFiles/file///nuvamudikavigexij.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/pafisoriditiru.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/sexinofugodovogim.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nmad4jfhfu44tq8evjaeqe5vc4/76878315717.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607161f47871e---99738280988.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/26702720520.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a625fbdf87f---mopel.pdfIn PDF document text
    • https://atl-50.com/files/file/suwukakigagamegenerovise.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160706ed0dbbb8---15367001607.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ccb5d533e06f5b8b646622ff266cbec4/49118678957.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/96580261960c48ab11c13f.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/fec59fae16da055b38343d9167c5c507/siguguzapafukuvozuk.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afc55f9908d---51607827873.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/92680581089.pdfIn PDF document text
    • http://sam-global.info/files/file/40530184871.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9a1299bd944c2fde725351bc803cf3fe/legowogegizumuralunadiko.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5ff6b5545---wolurimabume.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/19ag7snfca7sl1l3psevhibqmi/puxofinofojemiwezufiba.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5493f6e1d6---69126983435.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/110890ad4278e5d11f38427ccdb415cd/dasafivima.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/doi0v3uljs97hom4ogp6qnvcuj/fokovevolufi.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/wadenaloguvoboroba.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c649b382cc9---33889790037.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC952 17540 bytes
SHA-256: 039203462e0c63c6daedbddfedc9a956dce94e9a558f58984328714e4ed6dd73
font_01_sfnt_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7C 10860 bytes
SHA-256: dda019f8ce86f25ee2fec137173838bb6defb6be58db11055d95e6f33486ba79
font_03_sfnt_off00012870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12870 2636 bytes
SHA-256: 94d715ecd811953b7e1c24952c681b401dcd3a660985c965bc9867414a809968

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