Malicious PDF — malware analysis report

Static analysis result for SHA-256 183ea390a7be0742…

MALICIOUS

PDF

81.9 KB Created: 2021-08-23 09:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9c6966d525b2c981db5dffc617ac98ac SHA-1: fb3bde89292ee8fba2d28733cf7d02caab43440d SHA-256: 183ea390a7be0742b73b42b56f094f70d3e7a723ea677780f6a0ccf8fcf0d559
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to PDF files hosted on compromised CMS uploads and disposable domains. The primary purpose appears to be redirecting users to malicious content, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wawa757.com/uploads/files/tupogiro.pdf In PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/xusok.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/fifugolanakuziguzira.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b092a1efa---47018821159.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b8f56cc3fea74e5ec3cd308e97e4cede/nakomowewobotokadutopoku.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/38bdfhjjnksf1jt386ridq9792/17385413084.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/771utd7spptjjjnja9luvice03/juzugegibete.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/bozomig.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/17057136674.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962ac366e98---93999880945.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/9sm5ck1tahfqhjelc0ae054gll/80879790975.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/64cd7fcea04f40c62b470182955afb44/raxofa.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/15222968096.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ee4fdf6cfaaa3efc5702a45bab426476/dexujome.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7ab1dd783---fivekaradotibaroxubuxevi.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3d8be5a0b6ccda68952a5b0fd5ecedc2/26842104731.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/52556938355.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/bugusetobuxadufugipameriw.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/mukibujoruvefabeje.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/9084bd75de6b56305ec577fd27b3baf7/13724070739.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/d3ac035b4113996760440e8ca8126462/nomagalutimujiweditidu.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210601150751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=number+of+d+block+elementsPDF 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_off0000dd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8F 17024 bytes
SHA-256: 49ae02b614a7fb80a21afb691e7c8504e4e9bf244fe5460ffc3a1640bb3c56d8
font_01_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 10692 bytes
SHA-256: a83568bba802e8f53a80632fb020c0a1f221fb9d7e06a586626381ea2c3ba757
font_02_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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