Malicious PDF — malware analysis report

Static analysis result for SHA-256 278a1b44a614f59b…

MALICIOUS

PDF

92.0 KB Created: 2021-07-16 09:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c169ccf9bf427a2fe3ae83a811ca08a9 SHA-1: 4d7e6067bd5656267ac70029755669ebb3591717 SHA-256: 278a1b44a614f59b41972f7bcf887bacd9dfe3e9ce4ad2b0e2d1ba1192392f51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, likely serving as a distribution point for further malicious payloads. The presence of multiple links on disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/9kv269dl1pp43tthqipqdhurv0/43798802779.pdf
    • http://msslink.ru/userfiles/files/36303509030.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d1eba527d---gevatanaza.pdf
    • http://arredamentoambienti.it/img/file/kujologif.pdf
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/59487418907.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d8002bead56---kobaronezod.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/equ2shmi3h9sn7l6lghedoes7m/49854120455.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d659792940---buputunufabaxolunu.pdf
    • http://jkbprivateiti.com/userfiles/file/47595680841.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897f9a7495d---54342043419.pdf
    • https://synodradomski.pl/userfiles/file/ragiwemepitumeseluf.pdf
    • http://70sromans.com/clients/871711/File/84995842486.pdf
    • http://strahovka66.ru/userfiles/file/25483473966.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/6gvc4u42onhutpm6rpone7mtoh/24772516878.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/xovikunebemitikanozotowor.pdf
    • http://pogologistics.com/ckfinder/userfiles/files/xozok.pdf
    • http://curry-box-deluxe.de/userfiles/file/28855261160.pdf
    • http://hodori247.com/uploads/files/20411118347.pdf
    • http://nfc.soo.jp/file/serubegizenopomoke.pdf
    • http://przedszkolenisko.pl/userfiles/file/73123722783.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1a58d2693---44641005584.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a0e6c6aea---66631806896.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d42799ba248---88749887223.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/gklvq5v2vjnb1k3fst6lofbikn/29124997622.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/22cf78f2786daf2bd58f226ad806dff8/gigosulejivat.pdf
    • http://tradeweb.es/userfiles/file/mepodegoduvamosifig.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=tickled+pink+idiom+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102aa.bin
65ec94261d925012dc98c832dbde3acc5b118355adba0e62e1f796970926cea5
pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 10544 bytes
font_01_sfnt_off00011a69.bin
449f3fa4252035b0f49a9f28ef8c0075f1130e69b4ab38d7ce1ece809957c8d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A69 18196 bytes
font_02_sfnt_off00014a90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A90 16792 bytes