Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e2e677404edf10…

MALICIOUS

PDF

80.7 KB Created: 2021-08-17 08:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5196bfa32e031bdd36f2e8307d7181ee SHA-1: b0b1b7ecda87e1ab863373bf57c700ff9fd3ecfd SHA-256: a9e2e677404edf102c681128cd3fbcbcbb5062c95ca038081c430bc61b82a0ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=manifest+destiny+worksheet+answer PDF link annotation
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e44ef80596---42290392364.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/lomorotiterulitulode.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/157e4fa8bb439f48566297f233e4929e/23443693784.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/gomutabir.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/73b7d9ad4533b9e75463665381201947/momagexosijasowazabilon.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d87f74dda---55451023668.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd53d43060---xawejijiwabolifelivu.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/82916952153.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/dubemaromizisanozo.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210726183451.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/39509928978.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/maziwometez.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a2a6b6b9e---32873729976.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/vuxotibebemoxosuraz.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/bef4088fae991b931754852685631a9e/zomizoxomogabopu.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/75889870755.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c652a53c8---dunebugogubetovi.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/22507293388.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/5e5753a0d269a3d0a95dd404722d9cef/vuwoxukamunubufigagokaw.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf1619b424---67088659238.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/18171562709.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8be343fc06---5852951156.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC564 16104 bytes
SHA-256: 8d7b196bb242b1fd1dde88e0982a148fdd82628114a9b9c947b610f79e4c2f9d
font_01_sfnt_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001070c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070C 10688 bytes
SHA-256: 747e5bec91a98933e06d11f7235f6f0e0e6582c1f056619ca3dba9d5f07a510d
font_03_sfnt_off00011f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F99 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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