Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f242f849548fd7…

MALICIOUS

PDF

93.7 KB Created: 2021-07-05 19:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 2bdd046953a3dfde19cda7dd7dc4f162 SHA-1: 55018e12b0765a4deb175d4b92e88438dc78d121 SHA-256: 37f242f849548fd7b1e2b26b5d1bef12c45e8dcaa65830e4605ec285fddd2597
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample, but the extensive use of external links points to an attempt to lead the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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://inwebjor.ru/uplcv?utm_term=picture+collage+maker+for+windows PDF link annotation
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc7f97b5f6---rozevatagifaziwadojizimed.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/juwegiv.pdfIn PDF document text
    • https://alutat.com/data/file/wogamu.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/19390150534.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/iufa44rh68m4u4fvghjfe5or12/43835850074.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/2657983a3d52fcbc748b81abbe1ab590/viwikige.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/3d749c31c8a998abd814515f83423b33/75637198176.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ok0ha8ni8n8tv7rdpcbs2u33mt/vadofebolixalo.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/250241414881.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/diwad.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcbd131fa4---48954793931.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/kuevnfve7fs9h609dfs5vufejp/xelifewabapov.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/a6ac1a5f783ee08e423746cae3d4de2b/82013203825.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d3bde35a---72746861023.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ec698460f---35099778541.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/pijokaxolenojuwa.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/2a381dafc83def8145a9a77e5bf97a20/namizoxijisurevas.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b87d2d523---bajovurotumavibenowavafo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892fad3b585---2347756645.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/disoxabekod.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/6bdf7565035db678da0ca23710b07d2f/fekokoji.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/93332688527.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c11fc0d3e---miwexusokufa.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/bqjorqf8p90fugk59hu45lacs6/71763729159.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/956bb9382275b97f059c3e04aac60de0/daxagofex.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/534501ef791da2b1e28072dcef7e22f1/49831821234.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0a8f04a9c---zefejiwad.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 19196 bytes
SHA-256: e163e4c6b0a6c1d8fe303dce3c189e226786ad67485ae002180ff75a278a9ed3
font_01_sfnt_off00011f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4D 16252 bytes
SHA-256: 15510956be7ead9f824e209a6104b8be563ded270a313a9f6e525002084f8b58
font_02_sfnt_off00013534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4B 11100 bytes
SHA-256: f0e1b2e806816c4e302f3007566e53935b3fceb7394b88aa2b70adeef3145c00