Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaad1260f2f7b431…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 03:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a81c48e0ad1575ef6b03893638c2d9e SHA-1: 1faf6d5008f296e4765285a2cf02a293cd10fdc1 SHA-256: aaad1260f2f7b43191e91813e2ce7a55c5a3e5161489d77efc50832e01c20651
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://krisoc.ru/uplcv?utm_term=axial+wraith+kit+manual+pdf PDF link annotation
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160de0cd4809e0---wefobamitosovalefokazugi.pdfIn PDF document text
    • http://fini.hu/userfiles/file/30371050129.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/611d8d06b90db.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/22dddb4a86e7f454b332e64a4d3c6268/pizugojitejumovapevo.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c783977060---32806266340.pdfIn PDF document text
    • https://bamor.org/userfiles/file/bupijebufozifiliwofaniwed.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071bcf00aa5e---gufuxokapojuzudo.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/cab3b794c1861e23e623cebf2ed4d5b4/vifiguboriz.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/manabiputodazobop.pdfIn PDF document text
    • http://myslizdrave.com/soubory/xevaximegave.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/memolodevulipi.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb1add59d1---91734004831.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/4ef4dad6e6026f52bbbc82d9834650e9/setedenovozememax.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/40038564567.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/bosela.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080afee6e4f1---rasomavimi.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/dabekabiledu.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/7hsda16d4a0cp0q3ao7pusjemu/bugebinosoxivo.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/57916177474.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35e1f1fe23---89081426733.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/47119304177.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/7451797803.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2a061f5b---wowubabobetajap.pdfIn PDF document text
    • 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_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 18508 bytes
SHA-256: 4906240c94f203ad10ec1116a03df40606a0dec23dc3f6c00211786656ee2323
font_01_sfnt_off00010deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEB 10704 bytes
SHA-256: 87b8456f3b57c8043d313d52f53133361adcd59055f6eb2fa0186708117c29f0
font_02_sfnt_off0001264d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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