Malicious PDF — malware analysis report

Static analysis result for SHA-256 041bb1d20ab238ba…

MALICIOUS

PDF

82.0 KB Created: 2021-07-02 19:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8aa2b2879e56fdf6188ff1a57fa38ca3 SHA-1: 8890aff54baf35ce4a751627de9a1adb0c94497d SHA-256: 041bb1d20ab238bab98f4d6d1f239048bc44b5aeac894836711b0b43eefa0897
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://archism.ru/uplcv?utm_term=how+to+add+two+pdf+documents+into+one
    • https://watfordfairtrade.org/app/webroot/img/files/netitabix.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/64214081436f453f95c04ebc1cc2411e/xarokabedisabajezaba.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/5be60d672cd9b1db1939abc3d1753aad/gubupodezefiza.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b0741ba4d---xotadofezofo.pdf
    • https://nazragame.com/calisma2/files/uploads/janibefofoz.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/zixerosufemepexiduwiko.pdf
    • http://zkojicin.cz/userfiles/file/seludisep.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d651a352aa0---zederatojisa.pdf
    • http://gleneaglehoa.org/images/file/55069126080.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/lg8rl3ppq3bufrsnjn1al4j8l1/97589272803.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5e61f0533---bikikigeporagidudom.pdf
    • https://digireg.org/upload/batipexexuto.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609debfce4f47---furanofoboton.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/irpnr6pjloo7e5g35m91jb2f3g/vevapokedananarukinudem.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/bdhok4d39ogchber22e7bdg8gm/buwudugopofabok.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ebc0c9dcb---madepuk.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077ed485f681---xijebidi.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f98188e515b89df29970701a6f1da379/bojeduru.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcde899a27---jobijazaworuzewilofefo.pdf
    • https://triangle-electronics.com/assets/userfiles/file/kelilirivodafuso.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/fabexasirono.pdf
    • https://ludifrance.fr/userfiles/file/74753011321.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8d19ebcb---darazelexamika.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/78c84881e690b8a3f386816532ff437f/zedatu.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_off0000dd79.bin
2f64b3b7280ff4360a8b265a0af47717a7657415dd125ecd37349989813078e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 16964 bytes
font_01_sfnt_off000109b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 16792 bytes
font_02_sfnt_off000121ca.bin
820e6818df2b70629a33c8e8598054ace1b8bcee546415130024c10dee598927
pdf-font-stream PDF embedded font (sfnt) at offset 0x121CA 10812 bytes