Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c8d0a72316442c…

MALICIOUS

PDF

83.5 KB Created: 2021-08-19 06:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6db04df1bfdc6e911819f0c20d9692de SHA-1: 3e24d968e06edc02580617a40bb07839949b0c5a SHA-256: a7c8d0a72316442cfaf78698b90cec7342df894af7ad816d4c46d1a29a9fc401
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. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics indicates an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6602d35983e0ab3c632f2832db76dea3/25722292801.pdf In PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/31801963479.pdfIn PDF document text
    • http://bjallstar.com/upload/file/tetefufavaboxidape.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/59227964335.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/6d3c12c570587c743a29771f2acc5386/xigigulomugabuwirore.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/33427659313.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/4783425088.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/lemibu.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/fogiketawifebividuxox.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/427945bf6816ceefda7ecfc04693e009/fubosikakujaxo.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/204f0c62ae904edb24ab96a781222498/28620995853.pdfIn PDF document text
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/98838969344.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16119ca3c2c9d1---69412534720.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/65781854571.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16098924044f0f---46038337636.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec3f35de46---lakovukok.pdfIn PDF document text
    • https://avenue102.com/uploads/file/15706646058.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/bimegokikilinurud.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f9b5a28d5a84e0fdeb77bba2a75c0698/55877894497.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/rexukunogofetamotodog.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/75428840671.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/e03a52eb53e44f1ab9b32761cdc3959c/9259247922.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/5951801130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+report+stock+earningsPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 10672 bytes
SHA-256: 4be61088485cd262828f19a689a00246f75d8172a019688101283b60d7ec679e
font_01_sfnt_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 17124 bytes
SHA-256: 8b3a5391efcaa8d40b335ab1f1afaa935cfbc5ade3894c6779ce5e34ece8b165
font_02_sfnt_off00012874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1