Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c31a022fbfc0292…

MALICIOUS

PDF

74.8 KB Created: 2021-08-05 16:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ae85bddaa8af52af973fbe04b74cc2b SHA-1: 081a75bb95081490d44cbbe75dc14b1157d84f7b SHA-256: 7c31a022fbfc0292aac559600bf47d1b8e69a352d8fb610c0c29d18c786575b7
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content or downloads. The presence of these links indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9814

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 https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d18c7b95c---6230118254.pdf In PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7919d79fe0---danuvamosirobimodupi.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d0b80d13ae03041f539493926f9802b8/juxazofexapotogade.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7e494b0e4---povim.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860ebc20c84---xadabumosijarejo.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/98391884901.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/detopivumikat.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/51223180605.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/zipiviz.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/24126347599.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/90beb7b24ed7d36f6844dae786bde388/52212095528.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d61fe177e1b---gujidej.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/wamefadapirixovukijowa.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/5v6s0hnt9muid1tb392iq67rf4/59023602183.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16091ff6609f17---bolereraxojuzov.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/42283275544.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/6342cf18eb44ad540177f42c1ea8742b/74334447641.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f080c9783---vejedopesatojugaviluzopiw.pdfIn PDF document text
    • http://faradbox.pl/files/file/xilolefotebomizazozufumaj.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/bb454f06aa5be5b872132a127a9f0780/bobitesemuzug.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/35559623821.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202108040343229254.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/vureselunovo.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f674b113ef1---88522897926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=barbie+princess+charm+school+songs+in+hindi+mp3+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 11316 bytes
SHA-256: 68e521c376ac6f3bea31c54c7572bbfea103b1e65d52e01565c84861af1e9022
font_02_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 17552 bytes
SHA-256: c3c87c20d373c6d01c0c7c2f0ccb12a8d2e9b73ff9134cbf6f2dbdf4c7ccd033

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