Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79fd9b90be62e3f…

MALICIOUS

PDF

79.4 KB Created: 2021-07-05 19:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e8d95eba6f61478cc44e77bbb1101fb SHA-1: a122280e54518c09ff7894e471298b47457ca338 SHA-256: f79fd9b90be62e3f5ddcf92708b04ca70994c5bde1b262d8982967c863dcf321
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to these external links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/ae6f2b38876af6fb9107418236e697c2/1404919353.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ufn63thmh88oacrjheaavln402/wenifogugefex.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc64ca5a04---bodedex.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f566bce3fa---jegolag.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/69212762581.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4ab8368e9---dosofose.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/4llfue5shumnqd5d37dlkp03qo/11563920283.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c04bb958201---xorubifepomilojusitofiwe.pdf
    • http://synergyproperty.com/images/files/9627328902.pdf
    • http://shop-cartuning.pl/userfiles/file/liseroda.pdf
    • http://geostudio.eu/userfiles/files/julimewivalibid.pdf
    • http://tubietelbar.hu/uploadfile/58552632604.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c939ceb74e0---sifeva.pdf
    • http://nakatka.com/files/file/24447712779.pdf
    • http://www.prieteniitehnicii.ro/documente/file/xokurevosimas.pdf
    • http://otoozevran.com/resimler/files/dinajugosetufirof.pdf
    • https://pacpartner.net/images_client//imagesfile/nolawexuximapiwiwut.pdf
    • https://wsbtitan.com/images/file/ruzimamoludutit.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d5031f109c2---kudelunadiwakedodagumope.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/eb83a08885742aaf918a4a96ee2e3fef/92403451417.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075222aa2e6f---79532534256.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0454b876c5a377201144b6b23ac91c5e/89624824905.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c08f1092c10---pefuponamuvuzikenudob.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/4aa731fc374a04cc5a5586b5193b9fae/dojorunozi.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9a369d43---sajamilelu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=16+knots+to+beaufort
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608273fc75c33---vokinotuduzesak.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_off0000d36c.bin
591a89692826c596392c7bb4bb8ff0841a837884404cd0cb296e3e310240e3f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 17088 bytes
font_01_sfnt_off0000fff5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 16792 bytes
font_02_sfnt_off0001180c.bin
c141dafb0957c2117860bc1dbf7eae013220b9e12f6552f5f998a7d3818c977e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 10524 bytes

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