Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e41c9f0d682100…

MALICIOUS

PDF

99.0 KB Created: 2021-07-08 12:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87ba10791674936eef1c4a7ccf7694d1 SHA-1: 638b556de228918031255f5e3b427d5ec7c2aec5 SHA-256: 97e41c9f0d68210072ee6a82eed2eb59bfe73818fd0c345effcf7c127126af57
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e59702493---funekoweb.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1766bdf429c2b85741f704ebc0aaa32e/xizigukumixigorowati.pdf
    • http://idroter.org/userfiles/files/78692580096.pdf
    • http://brukbet.com/user_images/file/60056283546.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/86569815884.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/c794be313683e9e8be1a6f0348f134c5/bazapodukigapemobirivi.pdf
    • http://lsbwg.com/ckfinder/userfiles/files/20210621/0819524294.pdf
    • http://aarogyamedico.com/userfiles/file/piwexuwavimasusowaripu.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc5719c2cc---61873376875.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/50643378376cb41c4d5b46ea3fafe748/numebufezekorufigometu.pdf
    • https://fanaf.comarticle_ressources/file/xufovozavidutepemafesiki.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/2s96un66er5tr7sr868cfvdi8r/57143827330.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/cfca50b52c202b43b47505a823bdc8ad/71578893519.pdf
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/vawefizoxajemot.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5d6080f59---81140549513.pdf
    • http://fujavietnam.com/images/Download/30033116668.pdf
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/veweradapoturot.pdf
    • http://ipceurope.eu/assets/file/nepadojununozutudiginiko.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/sumagefezixepulezetevurun.pdf
    • http://elite-nails.pl/Upload/file/99059288256.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6tbv11dds9tl5ua5n14t0etrv0/15730245128.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc78a89940---derifuxirali.pdf
    • http://s-privod.ru/userfiles/file/zufedakefonubilitifinoz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=justice+league+film+series+characters
    • 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_off0001231f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1231F 16792 bytes
font_01_sfnt_off00013b36.bin
a4f8bc0221e02502fb501019f61d50b7d87784d09375bbc530bb6091aaf68338
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B36 10652 bytes
font_02_sfnt_off0001539f.bin
37351efcad16ffa7b644e61c94770265cd6007c6db3f3139f8e1d74a78e27c1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1539F 16656 bytes