Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6cf83333b108c2…

MALICIOUS

PDF

92.9 KB Created: 2021-08-04 22:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 731480aef5b24107d78331fb98145f28 SHA-1: c82123ad19b157d3e61e63ffc5644803e36bb95b SHA-256: ec6cf83333b108c268ca80d6ea4ac1c93c4e14d801e01a830383f6c98972f20c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm, likely used for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/de6c3e5d83c0d91178f36397f115d747/88705582906.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce52652b5a---bobisudolutape.pdf
    • https://paperland.bg/uploads/file/86250513561.pdf
    • http://industrialdevices.in/uploads/27858472698.pdf
    • http://pcccphucvinh.com/upload/files/73397426821.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/lr9dc95bqb2qc2a55d9tklpud4/33849126488.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/7c74c760a7b095d82addb10dddfe8f56/33212039977.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6f77477b5aa9bfac4eceb9796cce26f9/lujowoneridewiwowegewu.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/t08jsa5tqklukvctlc1b0dvc4p/85603295136.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gst1nqb94rflnqe7g1rmftuoaq/xitimadogexetimutexo.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/a5f6bf5a4254c9274d1350806902bb77/35109998998.pdf
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/gelosemijagut.pdf
    • http://kaupa.cz/userfiles/file/vebajutetumezetebuf.pdf
    • http://dienmattroigiasi.com/uploads/files/79180339173.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/6431f842f5863eaa015f6e465640de8f/ditigovope.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86c51490b---47938751133.pdf
    • https://emauto.lv/index/images/up/file/84013295800.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/me7nt54umjmk0fov747h654vjr/sikobalofon.pdf
    • http://shinies.ru/img/lib/file/72018883132.pdf
    • http://beming.com/ressource/site-image/files/90111424200.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/b1579673afe5f9d996233cca143ac019/5008792095.pdf
    • http://langfordfinancialservices.com/userfiles/files/77390904842.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210528093022.pdf
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/xobuted.pdf
    • https://marwaautorepair.com/nbloom/fckuploads/file/15099864926.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+fix+an+electric+stapler+that+won%27t+staple
    • 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_off00010935.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 16792 bytes
font_01_sfnt_off0001214c.bin
7269c27ac91aec3eb9bdb100eec115901b83370fc04a5099e0554ae19d25680a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 10788 bytes
font_02_sfnt_off00013a2a.bin
9df4ab50a620b12c86554bc1743359d0a1b4d99ea6d38eb9465404493059ed92
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2A 16612 bytes