Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b7f67f228e85fa…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 14:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cce466ba1dd92865e451cec6946ade5 SHA-1: 0c13e2511685171d52912fba1218ef7fd0d4928c SHA-256: 68b7f67f228e85faa0513ee9869b5d7578c4b6abeaa6bd63de2a361da040b8cd
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains. This suggests an attempt to lure users to malicious websites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/2c2fc1c290e4688e94f4971c780cefb3/52202990806.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/5891433e52b6e6ae05c1203a4c5c33f5/51209211798.pdf
    • https://tavio.ru/files/file/83889920443.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ernn9qisfdc12t2u7ohrnjui1q/20855870842.pdf
    • http://ed-web.cz/userfilesfile/sisulimixapimabafotof.pdf
    • http://exosportsante.fr/ckfinder/userfiles/files/wutugipiwe.pdf
    • http://rogo-rotterdam.nl/files/4723546612.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/tkqgtvl94b3va0eltcavvkd737/79261365515.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/a83fdd6bc60355df67ec76e524ad006e/31528439411.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/kg7efrikv09jb3imjfeq1res31/31344068681.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f00c3ee69---luporoxipotu.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608387e311703---bizefifasenola.pdf
    • http://aryajob.com/user_upload/file/fekutokidajewekegupu.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05bf5802d---ziketumagefu.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a924d77e9b0---36038802068.pdf
    • http://jevades.com/aircraft/fckimages/file/12051327587.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/sv54fjkff2f22q7ohrv4eidjsi/tizusa.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/29954862975.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e104dc364f01731dd615a293a8f34c56/xujejiwusisizumo.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/12490998050.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16079b103ad0df---joxef.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b486cb98216---78780784271.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/sph7dt5jfr918sh3sokio68h7g/bebated.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16099cfc238cdb---gimadekomodi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=non+reproductive+cloning
    • 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_off0000ed25.bin
dac8dd6311b04ae344b44c1c6a8f9be40bad18b38b143294345589be4db69416
pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 10504 bytes
font_01_sfnt_off000104e0.bin
4bbdfe80c839bef3e86776f863e06abbd9039e2bef893003ce9fba71203fad45
pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 16880 bytes
font_02_sfnt_off000130f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F1 16792 bytes