Malicious PDF — malware analysis report

Static analysis result for SHA-256 998a0da8a0830e7f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 08:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 90e7163a95b7f83234f38fb3bb29fa60 SHA-1: deeee7b00ca2772ac1a5d8e0f4c2928aea090fe9 SHA-256: 998a0da8a0830e7f54006e2f3a113faba2460346c36ff9aff934eb4e12202a01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The URL 'https://allytemp.ru/uplcv?utm_term=caller+apk+download' specifically hints at a potential lure for downloading an APK, possibly related to a scam or further malware. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign.

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 https://allytemp.ru/uplcv?utm_term=caller+apk+download PDF link annotation
    • http://jsdarvin.com/files/vulapa.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/96663490419.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161402a240fcae---65708944808.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/13097136345.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eef26afed4---duwetupuzomemotegudovig.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/vegavowavixurapafo.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/4100331589.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/92230489143.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/mugirepokupigewakiku.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/pifori.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/tagamovegeb.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/29072514574.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/63086880225.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/88055805746.pdfIn PDF document text
    • https://medpressa.ru/files/file/fenokegapavofuxejelesaf.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/74072591866.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/57047499397.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/60769928856.pdfIn PDF document text
    • https://synersys.fr/contenu/file/19631067004.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6d07727f0---dibogoladezurekojufel.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135bbe603662---dorazapewalukor.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/20777863222.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614269d41974f---kegavofadobopal.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/vonulojirapuzok.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_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 10236 bytes
SHA-256: 97def46893aa0a3fa8903479930a1d01a02c5944a63d3b3c9719019791d03ca5
font_01_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 17616 bytes
SHA-256: 729ad3e64d412650ae5b20348cbfa9e7b2e0624f794a1324bc8b12630001b257
font_02_sfnt_off00011f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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