Malicious PDF — malware analysis report

Static analysis result for SHA-256 268eb9d4bb9af5a4…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 03:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74230ca923942a943420f159f48e18e8 SHA-1: 04e75681b309b9ab79b32cedff5c2bdff1ce1755 SHA-256: 268eb9d4bb9af5a4a4f67e11d4dc4a92b8448266fea5db3f91255432e025d3f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=epic+conquest+apk+download PDF link annotation
    • http://bladensburg.abwingsmd.com/uploads/files/42514367467.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/94992121018.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/wusegawezeb.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/xedurazujisusolok.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/73894952442.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136d2e6e4912---19090450414.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/43206789887.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/setikevubupazilefokisake.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/77990845833.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142cf720eac7---67552270172.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/45978644113.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/zuremun.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/1044962490.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/pigejesumoga.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/68982935467.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/48937151932.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/27459743505.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/nipuwuxa.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323a1f44c5d---gibuba.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/lekepubiwi.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/44626292923.pdfIn PDF document text
    • http://belovosushi.ru/files/botobexixifotiv.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/lujefadikel.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/12tun6674a17tve9gjfk50fkt1/72423730776.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/aaacd7e394849d5d9f5b14654664a180/35694388025.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_off0000dbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB7 10816 bytes
SHA-256: d25078d48f7471b51739db84fb5bfc5e3df928b1815d4d1f1545d7326ffeea17
font_01_sfnt_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 19948 bytes
SHA-256: 4fe5ba0ace8bf339ef2ccfaccce345ba6a923fe5c8cc9d51ad642a4937f4ee4f
font_02_sfnt_off00012901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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