Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9051ce1b44539e…

MALICIOUS

PDF

68.1 KB Created: 2021-09-03 03:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ff9a730e26874eef4d5f780af6d2c847 SHA-1: a128252041e2a5338b935172c13847ef8f42dc1e SHA-256: af9051ce1b44539e910dad2dd8385bf6e70aa3166017f8fbbd60c3b80f2f6023
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common phishing lure technique, presenting itself as an image-only document to conceal clickable links. Multiple heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 68 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
  • 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://ineke-ott.nl/keramiek-beelden-imagesfile/42301276421.pdf In PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf5edd5bb---12780482419.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/63473585909.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/891172cffba6dd97749b3c4746c3af79/tavevu.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/de2a04785820c87cf852e8da21359aac/69585808609.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4a458f708---38316939822.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edb920ade1---rofozewigowetovoxame.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c789222ba1---koladibutokola.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/mowuvivumatejupumunodu.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/38954026530.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c870312c4d8---vifepusowutigob.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cde655cdb---wetogaxenewipodiwajolub.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/zapovivo.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/2c8fe06235fbe526e51693403ae31c97/gadedapijulapivopu.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/43007422527.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd65ead3809---gijelufazotugebur.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/44662596935.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/dufodujudev.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/qbtq7g6l3jqbfv7tbrtkqi10s3/34300319724.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/59825202166.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/708135551.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ee18a20ab22fbddf43adeeb31595a701/zowexok.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/subimenufunig.pdfIn PDF document text
    • http://shesob.com/file/files/14454674203.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/duluwizodetoxebew.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce3bd99299---87659571973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+ifrs+1PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000b387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB387 13840 bytes
SHA-256: 3a7a0b0c102fc30e7cffa781f20abc9b3f82bd85cbdd99c22de068dbbbc6c32d
font_01_sfnt_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 9736 bytes
SHA-256: f70aa70955672cf0d5fad33c516a848e0c6424b9b468af3b00b0cc188c34aded

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