Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75f7fb12eaa3efe…

MALICIOUS

PDF

79.3 KB Created: 2021-08-13 18:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ae107b04119669f6389922ac0cbc879 SHA-1: a9e5a20367f39625cdcb0536e9cc083291d1b08b SHA-256: c75f7fb12eaa3efec16b4f5bf438503fa1ce6477337651d26dbbb927ea7ffd55
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised CMS uploads, specifically WordPress sites. These links likely serve as a lure to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5286

Heuristics 5

  • 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
  • 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://a-xian-coat.com/uploads//files/202108080827236313.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f98464c35a3---sozugulodewufuxe.pdf
    • https://nmg.lv/img/uploads/files/morixanusaf.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51177ee65---noxolesazewujenoro.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/c4b7d8cd7a28a7931336932fdab1a781/radijolajomid.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/340cdfe14acede0fafb6e2e26bd83688/99569065559.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/suxulebatukavakum.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/zavekometeda.pdf
    • http://uralteplostroy.ru/content/file/21863209695.pdf
    • https://universitecentrale.net/uploads/FCK_files/file/pimivus.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0af30d151---83052346999.pdf
    • http://njxinbell.com/upload/files/99117006653.pdf
    • https://cochleartudaskozpont.hu/files/kidalelaxumuviwoded.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fdfcd293c---75037693075.pdf
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/8280862463.pdf
    • https://addsfly.com/userfiles/file/79501748301.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8157e54ebc---xusavopewarijag.pdf
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/duzolunusulezubutorek.pdf
    • http://yasairamenbar.com/uploads/files/5810110691.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/75juo42rlm77u1hrmp2uvdk8no/baresexaziradofakinuxov.pdf
    • http://www.css-jp.com/upfile/files/2021/07/30/60562287593.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/27c4037543b186f9e4ffcc808ff423b6/81375567270.pdf
    • https://bloomland.com/sites/bloomland.com/files/mukibujoruvefabeje.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/9e9283b3671c10f1bd96cc63357dd545/xiremorunuwafudoma.pdf
    • http://agcslohian.com/userfiles/file/bosikekolop.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=can+i+stream+nbc+on+roku
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb17.bin
b2da1c76538c5f5b2f045632c8e0f54c067b0cffe4118ea8f9693df4c60b4baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 10708 bytes
font_01_sfnt_off000113c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113C5 16792 bytes

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