Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d110e6b8afcc7a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 15:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f158befd468b8ee69ef85bfe77a2db6d SHA-1: 9009ac79c149b9235204f816423fdea58c4fd05e SHA-256: 73d110e6b8afcc7a3673482841bacff4b968aaff5fc041b1abd4d57480b7288a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=notepad%2B%2B+code+compare PDF link annotation
    • http://megalaserasia.com/upload///94650358362.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/fuwam.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/totoxew.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/35886704339.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ht73f4drjiovend9ighnqn1399/97163017609.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/demamagesuzitupadipuko.pdfIn PDF document text
    • http://come2menorca.com/images/file/wezap.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/800576385.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210915205355.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/67040723461.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/91943745002.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/tukozuranagunofinapaxe.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/25449324686.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/xikasesamesotaxijal.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc411d4b4---40884641851.pdfIn PDF document text
    • http://gardatrans.com/content/Files/tawavuf.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/lunaz.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/46124906824.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/jizapefutuwakofuberaxazun.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/7d0036ff01231949fc2a1aed781e055f/77190590713.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/49130808715.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/fural.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/kemozulimi.pdfIn PDF document text
    • http://kodemari.info/data/files/mokotadurubadojewegojug.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b90d6d899863186ca98c3343e9a506fe/61365957695.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/soxuxaxoxejuvazijeko.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_off0000ddb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB0 10244 bytes
SHA-256: 8b566753c60472e9832e51d1154f5a655420b627ea43062344f7c793727e46bf
font_01_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 17708 bytes
SHA-256: 990300771cf4c624ece39471241440509d21ada121b8c9a45d7fd708b02d5d8f
font_02_sfnt_off000122bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1