Malicious PDF — malware analysis report

Static analysis result for SHA-256 7daef31a06f21e2d…

MALICIOUS

PDF

93.2 KB Created: 2021-07-04 00:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 822f1f832e18ec6ea5b8539176f16e5f SHA-1: 3da354b3226132e2ae998df605e974e3ee2b869f SHA-256: 7daef31a06f21e2d18046ec6c3a0ec65d3e4328eb6f0392d0c2dfea34fe6c35b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress installations and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://wastran.ru/uplcv?utm_term=isaiah+9+commentary+matthew+henry PDF link annotation
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3ce9344bc---nivuxakezawavi.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a0676182dad---59360733515.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/231kklaba2eucmei8kfce7uk4q/kijizixupomijerufidukux.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/55558639965.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/08lg6t8s5ors7cig1rp5dh4u4m/5647925750.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a6b661e74---refijedofivivovaveter.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9fcf06a90551f2721bca1b617e847ba8/56042860958.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/kewulidotivemuduluruxewut.pdfIn PDF document text
    • http://royalproductsonline.com/userfiles/file/pegakajepopidarilabemufub.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076efe29699f---somewidulawawiwepibi.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/b9c6fb9e59619f7f8502753fc363fafd/bigobuxogigogilud.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1083e5fd3845e49dccb079bc83d62e46/86667073948.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160cdac2a41ab3---99206715588.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/1oeoqfi0vs7egkfqqlbm3ecmi3/37240513203.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8df63526dba1c3da8341493c5c5abffb/85314185736.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/47e567e44ab0960e7c86d6ee297e914b/wolisifasuxeletija.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/c02d61945c869d55462cd6f1aa48651b/luvoroduvepawinukuwotet.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/32752128002.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f6d631d83cfa87ad7509a09f74460ba2/97829272990.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be6ab570749---93758248449.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/50597154105.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/saful.pdfIn PDF document text
    • http://ashioke.com/images/library/File/49144998346.pdfIn PDF document text
    • http://goldmustang.ru/files/files/32061349359.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 10768 bytes
SHA-256: ba8d29c1a9d4995d233e4fe2eb732cc2be848f76c99eea33b647e7bbb16ff5d1
font_01_sfnt_off0001212d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 17872 bytes
SHA-256: a22648e0d2b202144d693a7413bc6cb1cb8b17a4f0d9f63420762259406ad46a
font_02_sfnt_off00014f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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