Malicious PDF — malware analysis report

Static analysis result for SHA-256 3799d883d4e92b78…

MALICIOUS

PDF

50.4 KB Created: 2021-06-10 21:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8852618cccb1139e712a3829c63b593c SHA-1: a0fb70af95d136de1290a8c4c1c4138cee9e300b SHA-256: 3799d883d4e92b781e6eda59800a1b33729e21eee341f497aafec237a07c5fc0
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is designed as a lure, presenting itself as a document but containing a clickable link that redirects to a malicious PDF hosted on a compromised WordPress site. The presence of multiple links to disposable hosting and compromised CMS uploads indicates a phishing campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7360

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 50 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://allytemp.ru/uplcv?utm_term=percy+jackson+and+the+lightning+thief+tamil+dubbed
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb1c781840---kinesisigufaxisatut.pdf
    • https://butchercurnow.com/img/shop//contents/gepozasoregumibifomabovef.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1f764ea81---tozidikopidibidaros.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20210531_D5FA0BED22C1056D.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e44db9c686---12262515717.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/82af5c5aef6f6e900fa520c6f135b0c1/54701393636.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af93bd467ea---limusuro.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a229b31853f---futagepop.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ea16396a78b267cc9f07e540b6896907/rezajevarer.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df2ace32b4---letikulegusagonur.pdf
    • https://nhachoxebus.com/upload/fck/file/nezaretubexexapofivanid.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/92a1243d0a460f87a70c9f5c8f138c33/18097814664.pdf
    • http://dekoblickfang.de/userfiles/file/7140667684.pdf
    • https://corpusbg.com/files/fck/file/9415329476.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3a16a40d35ed80f44cacba419aa5fc1f/wufob.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75ffctmnda9o2jalkk6t4ifi66/lupekavobewux.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/cd5e9b8ca32f75a981e7eea6858a76ec/40298581009.pdf

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