Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab25cce97de73b6…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 23:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89f02771a805f62c93a2a23bd5cf73ae SHA-1: 124da2e1724b849738ef0f474bdc491f78613425 SHA-256: 0ab25cce97de73b6d5cdbde83b06f3823087712f890dfa73a3bc56431d7c6506
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lehnerkom.de/images/uploaded/file/8087817741.pdf
    • https://flomogroup.com/upload/files/xifuzigenubaguwu.pdf
    • http://vibrator4you.cz/UserFiles/File/16580299013.pdf
    • http://wami.cc/data/files/96607400794.pdf
    • http://vvk-wiedermann.at/userfiles/file/wenawagozapajoluxunupuzo.pdf
    • https://deycaterers.com/ckfinder/userfiles/files/kanupivu.pdf
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/dikajopujokakobemuvelu.pdf
    • http://bukhatirhomes.com/userfiles/file/84653259639.pdf
    • http://ladna.pl/user_images/file/87718717196.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c82c60f04c---ferulofeditifanobo.pdf
    • https://dansobentre.net/uploads/file/xasewanevuvagajida.pdf
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/pafuvun.pdf
    • http://grandviewcommunity.com/userimages/sipam.pdf
    • http://resortvillairene.it/userfiles/files/tumavazuxasibapasabakazas.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613d87e2a9911---goxenuzobeja.pdf
    • https://skykharchono.mn/editor/files/mexoselulobatewiveg.pdf
    • https://rlmahtani.com/userfiles/files/xasijizeferob.pdf
    • https://znalac.com/userfiles/file/biwepegirej.pdf
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/luzafefulezepibut.pdf
    • https://austarpharma.austarchina.com/upload/files/nirin.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133525dacd59---75970413225.pdf
    • http://yjeverspeed.com/userfiles/file/fufoni.pdf
    • http://gzhangqin.com/uploadfile/files/40305724232.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+app+fake+location
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afc10513aa---sagok.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec7c.bin
21528f370f38039c55999b289c2fa2773238ccfd7a0d5262caed49b163160874		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 10520 bytes
font_01_sfnt_off00010487.bin
3e1b73485649611abad118d83b7a3815dc86da97025eae0cdd95b80bb756ef30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 17592 bytes
font_02_sfnt_off0001325a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1325A 16792 bytes

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