Malicious PDF — malware analysis report

Static analysis result for SHA-256 dabd1168cf2a232c…

MALICIOUS

PDF

82.4 KB Created: 2021-07-04 18:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18333301961d5130aa0f7678946932b4 SHA-1: 84d8dbda0122b32db65539e30e4c90c62b0d9816 SHA-256: dabd1168cf2a232ccfbaca64014b884e57e4d566c47a4dde2e6db44095192b1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable domains, indicating a link farm designed to lead users to malicious content. ClamAV and an ML classifier identified this PDF as malicious, specifically a phishing trojan. The presence of multiple external URIs and link farm characteristics strongly suggests an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pinzimoniofiumicino.eu/userfiles/files/vawotugipomarajaza.pdf
    • http://poltinik.ru/userfiles/file/sonobiliwugusij.pdf
    • http://www.ecostroyservis.ru/File/tomaraziwavinux.pdf
    • http://azizolace.cz/images/file/53825497273.pdf
    • http://atek-ent.com/upload/file/magoxovusafudozigiwazo.pdf
    • http://pensjonatagat.pl/userfiles/file/51474440203.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/nuwatenusitesefum.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a922b636a---69937387157.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/r7fj1ueag0as9n6t4scdi5um80/libapigujuwukipefafuju.pdf
    • http://hsound.ro/images/custom/file/91003813776.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c20c940ef26---46355073395.pdf
    • http://goldnumber.info/userfiles/file/mixufifosibixigus.pdf
    • http://garantc.ru/userfiles/file/sakak.pdf
    • https://muguet.fr/sites/default/files/file/28980782277.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/635gpav81iggqmltv5od3u35fe/71794619526.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbddb648195---12337203695.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/pk729s9u62atp3qv03tiknseq7/22240696782.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/883d3b7fc50f903451598937f5a704bf/lowezivakidurebufanokamat.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0cdf69744---gidigafefexotanaluwez.pdf
    • https://publicbridge.pl/userfiles/file/97590076423.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079426b7e2ea---guropibenu.pdf
    • http://biancoacolori.it/userfiles/files/fotevetijifadibufu.pdf
    • http://duoctruongxuan.vn/userfiles/image/file/ladakujeva.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ca8c0945---notedunomukegotepelevuwax.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbccfb3822d---fowipupipomesijed.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=darling+stand+by+me+chords
    • 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_off0000dbb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB7 16792 bytes
font_01_sfnt_off0000f3ce.bin
43afba25194a25ea40d28daee2878af3f9f0c0a98aa8d3032129af325f632bf3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 11072 bytes
font_02_sfnt_off00010d35.bin
b3cbcf02ca2533225d89251aab50f0b864b8ddaa049427fd011a085e5d0ffa1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D35 17332 bytes