Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8978b0cd9b4808…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 08:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc2e697076a1838c3cb473f921fc0834 SHA-1: fac774f60d49e7b29526b630c94ed839545bde7d SHA-256: 8d8978b0cd9b480850e97a01adf14705787898cc95c42aee03d719af33cada61
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS uploads or disposable domains. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/denojefovovosivojemoluj.pdf In PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/9q6ofs0oou4r4p2ngccest3761/47516866592.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/70093841940.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/votunapobolukobenixuxe.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/37400855460.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/33837522959.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/sukorapekuwapadoxosegow.pdfIn PDF document text
    • http://bdaudit.ro/userfiles/file/58998968526.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/kajewifobuzurubaxiv.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/10456105406.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/49683375762.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8683945b---35505241559.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/61443956272.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c433e66b17d---34933104611.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7d8ca00fca54e45f3b2643694d4940ac/patimotojorevomojod.pdfIn PDF document text
    • https://heider.ru/wp-content/plugins/super-forms/uploads/php/files/7690e3a996c035362447d6a6c782b79a/neponitipikuguwepijaj.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/68usv9169bji4mb8tlltq1dck7/47186868242.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/nimabejogis.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fcfb4d59e---kinekuta.pdfIn PDF document text
    • https://ivanamihic.com//files/rubewalujidepamilesiv.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ft5fees6fedcutsjm3jh93aro5/limesugumogejutuk.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f37c156834---91318888512.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/83375184187.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/5e7996a757eaf175a4ab5c1eeeeffa7c/3555673019.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/rorexunipomujal.pdfIn PDF document text
    • http://webursitet.org/Files/file/82459637748.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c711a76e98c---kitowiwibirikupor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tolerance+chart+for+hole+and+shaft+pdfPDF 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_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 17392 bytes
SHA-256: 67a9d88b9581616203a5879b1ec8d912ad0f28ebed7a471d90b27b8d6cfa5e69
font_01_sfnt_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D6 10588 bytes
SHA-256: 0ec4913e44f8053e02784866e5db653c33907efad73e3b4601f2db60e98ac3ab