Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f8e90e7c7c70e0…

MALICIOUS

PDF

71.9 KB Created: 2021-07-10 09:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2032dbc8894860906edbc26d9564b42 SHA-1: 098bf61c2c227fc6fd866e69fd25e067062dc3da SHA-256: 83f8e90e7c7c70e03adfeba92632f07a341e3f3cbd1c37c60152763a12351cba
176 Risk Score

Malware Insights

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

The PDF document contains numerous links to compromised WordPress sites, suggesting it is designed to lure users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b96eb4914f7---namizunezafupes.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb10f23fbd8---nexez.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad8300174---burapudelorej.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6e1f8294bb564b97eebe322c39f3a48d/rawufekenonoxu.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af62a0203f8---vapipelemenupe.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c34a4d58859---jusavolidavaletosap.pdf
    • http://bluecreator.biz/ckfinder/userfiles/files/2642353375.pdf
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/30702327139.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/8dbf93d8da26cdabeb0625c39b76344b/gikugivubobobizu.pdf
    • http://goref.ru/files/file/wodikedokuvig.pdf
    • http://skrabl.pl/www/rpbd/fck/file/99416819391.pdf
    • http://collegium-connect.nl/ckupload/files/tuneper.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/e0b4b73400571af535d3841dd1b97a86/zofatasixad.pdf
    • http://moda-minulosti.cz/docs/momin/file/4001701746.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607697798e6f4---82740032411.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609845d658ca5---45136068571.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/linopuvufabomiturokesafo.pdf
    • https://ludifrance.fr/userfiles/file/34972638251.pdf
    • https://ratsimae.ee/media/contents/file/48993769029.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16094d8c1e040b---punexarujokaponareg.pdf
    • http://bluecars.pl/userfiles/file/tutasubedufidiset.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9c79c267b---kezofug.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ea6d05e0ccc7e7ab4eda8db8b1167115/wasivetevofatibu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=watch+the+purge+123
    • 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_off0000b909.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB909 16792 bytes
font_01_sfnt_off0000d120.bin
7d0df88673ae356adecb9fb0599cfbd9352fd983fd7e595217827f43c2aae7ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xD120 10560 bytes
font_02_sfnt_off0000e97d.bin
b0c7a5304d98ebe60414813c6aa5627fa1e381a802bdddf8b078c78817b6411d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 16160 bytes