Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d81d79d980115f8…

MALICIOUS

PDF

99.3 KB Created: 2021-09-06 02:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 35e1cd639c37bf282123ed7b57e61184 SHA-1: 74464732360d46a968595cf9d0aa4511af829a75 SHA-256: 6d81d79d980115f8f6b67ba771ebb048a85441ca58eae072abea0b698a2a7596
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and compromised CMS uploads points towards an attempt to leverage these resources for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=guru+granth+sahib+book+in+english+pdf PDF link annotation
    • http://iltorg.ru/upload/file/33508479919.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/jenogiret.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/c7ce63ee6a82ff75ffd53e448ae94dbc/vokuvodikumirilisuposimi.pdfIn PDF document text
    • http://ergakiland.ru/files/files/kubogogimibisode.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/96682479138.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/xufaxezorojerozotepek.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/97832715474.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d497e8296f331ede19171e07e466939c/41563619262.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/lejoregefuxin.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/aceduskfhnl2hr0ja9tpmuvqgi/jujobe.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/61359050119.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/57258518282.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160763eda2bdec---95823909588.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210510111828.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/bba11fb54136826c57f888fb33f8976d/72187137271.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/xuzalepakofopejebotuf.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/q3qbtd1460f11tekivr0i7tj64/88148344871.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/68241701270.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/da01893203446a6cb40cc325f4f701b2/17788096568.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/zifavafugoputilonivi.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/14361480243.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/7cf8349cc08ca4680bada528e94dfe1e/38010142496.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/79260309111.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d31b59bb5d---tupiruxunezoregevez.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/57523890481.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a16a0269f024f05e49ef3e06619e325c/93639965092.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/rimere.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_off00011897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11897 20284 bytes
SHA-256: f67757fe6a41ee92e5be6d5cade8885c2f6472e04e72c61f85787da8fd0ec4fa
font_01_sfnt_off00014d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6F 11148 bytes
SHA-256: 2ea1fc08d26c5b22628e64bbc95a162c0dd0184394200e013b229f3cfbad90ce
font_02_sfnt_off000166fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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