Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fa0d8a97592410…

MALICIOUS

PDF

73.4 KB Created: 2021-07-15 12:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 531f2765188c561679c421d234ddc813 SHA-1: d37af9095a0f118d5ec9a943e28ef80e7ba47fab SHA-256: 12fa0d8a97592410bfaa9de7a2c2baad73ae466bfcb5a1dcff34d9e5e0050de5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=baby+doll+in+spanish
    • https://study4student.com/cache/fck_files/file/2719131803.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/f21759269fdaada556385a3fb1fd2b41/nedakotupudejetidobod.pdf
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30c20160c0---rumunosifilodizowuwosuro.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/xezamezijesodikuroto.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/f51574e79a66dbcec53d8daec3725b7c/digozaba.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/dmsj9cdgnskcjc5esljrqvqdas/2500372703.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/n3n29uakc11d85k1m1khnia8k6/87494160788.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6c7c70540---sizokutagulipemitanajivar.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796e271a5af---71129902142.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//vetifiwenoraguwola.pdf
    • http://tuzvedo.hu/elemek/file/71689956810.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2f07f0588e3839a759762525cc133bff/bimijokujavelafimo.pdf
    • http://alexhoffordphotography.com/temp/files/file/wobumalunino.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bad267cb9---jefolixadikupagusof.pdf
    • http://sbstroy53.ru/img/files/teveminebugem.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd68ba512ca---judugunisenanuxexuxumuk.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2205c2ab36a3ab971822a44ab1423a07/19298172791.pdf
    • http://haithuanphat.com/uploads/files/mokewaxinitepig.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/6fj07vmn0s56f9h0klhrf6l3l0/1475356993.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a9433b25c28---zigevaxedupopip.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608771a96b736---89559070019.pdf
    • http://voszveszprem.hu/_user/file/budeligegokutagop.pdf
    • http://bmcnx.com/userfiles/file/87991564608.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_off0000be13.bin
9d7d1c32994da3185104ddb69ed463e19872439a8751aaed95d05c0947e000a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE13 17060 bytes
font_01_sfnt_off0000e91c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 16792 bytes
font_02_sfnt_off00010133.bin
07c52d0f577af71863d29a06ad658b2dc95140fe4a2ec58da21955725ec14e41
pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 10468 bytes