Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1df2e5ab6e1aba…

MALICIOUS

PDF

94.2 KB Created: 2021-06-30 00:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e98e0fecc6dd528c0556fc6dc7a44b43 SHA-1: b77a7854367e7841411e8c27f1485ae87abeb851 SHA-256: df1df2e5ab6e1aba93e01d3e91d33a5ac25ced4c89f58f1525a030545cda0577
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. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host further malicious content or phishing pages. No scripts were extracted, and the document body was unreadable binary data, indicating the maliciousness is likely embedded within the PDF structure itself or through its external links.

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 https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a47142b5---39474912988.pdf In PDF document text
    • https://betentour.com/sites/default/files/file/zalanezirubikorudi.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/97d30a3ec7b16ccdf915a97e5837947d/72394045076.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/ec8378d85df409750828ea0d2caeb9e3/60826396536.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1a2d9fc06b6d8d2037a021fcf2852d08/taturixoxefonufijaruforar.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/040811065094.pdfIn PDF document text
    • http://adveotec.com/img/file/sujefigesagabot.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8d28f5f9635ab96d4ddb1f811b5f0dab/29728150262.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ffe9c1k16ftign24fku61o7nvg/ranemodafavogug.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/jogovadip.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/zupebodadorogup.pdfIn PDF document text
    • http://hasyo.net/files/file/xerubowadigidakewiruw.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607978ba2eabf---mulofaxuzekikupezamuk.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc86d777e98---55284678531.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/90910665210.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/bezifino.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091a4e7b256e---zimipenovefobasevivero.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7d1d202803803652d82f49f00b8c9233/gesev.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/91519476658.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f2353b52d---lukitib.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/69ced5f5de7cdf6d8c992a493216da5a/9092427898.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/bb79ae3deaf8e4edf1823f3a50152a35/42305729262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=funny+gay+riddlesPDF 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_off00010df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF4 17264 bytes
SHA-256: 0cba0d41a4ecbb609d8429060735f429be629a84e876ddc5b2bfde39d4233e3b
font_01_sfnt_off00013afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFC 10396 bytes
SHA-256: c837d44f1cb22cf2f6fb12ac652bc5c31058523e6f4238fb58c5bc2f2e5373c5
font_02_sfnt_off0001525a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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