Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b85d70d88b82030…

MALICIOUS

PDF

89.0 KB Created: 2021-07-24 14:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f884d5e074d6fb3f4d8a867ca448a20 SHA-1: 0dddddd0df99df7d3770f09bb1f4722b425a0e35 SHA-256: 4b85d70d88b820303fcd83daed655c437dd2a7e98eedcb94ccc57ef096e5ec98
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The presence of these links suggests the document's primary purpose is to facilitate phishing or malware distribution by directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://aven.su/userfiles/file/fakexabikifijorezeku.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/jowusudib.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/4fd1344672797941de4bfe208d9773aa/fusejenenisip.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16092296695ae2---letovovip.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/9e79100c756b475a6cc4f72070ec140f/sigudatanesetoresodomot.pdf
    • http://df-2.de/images/daten/file/modupudosaw.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/ebccde6d1c75908a94aa86869eb15854/36667286.pdf
    • http://gibisch.com/files/files/96270994827.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be8b1cb7ce---94444273814.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759c993b0a7---wagezupobonekufi.pdf
    • http://artetendasud.it/userfiles/files/41610738832.pdf
    • http://nedirajtebosnu.net/userfiles/file/55338659817.pdf
    • http://idaskitchen.org/clients/d/d8/d86ca706a5600d452cde81e4a21b2d68/File/sisoretipelidonasugobol.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c5dd88a01---5215995431.pdf
    • http://digifast.cz/userfiles/xasexeludoxufapakir.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/70878957365.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4ecb8e81f---nesokepofuwamo.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e61544b1b21---dusase.pdf
    • http://igigeothermal.jp/userfiles/file/xobavaxevuv.pdf
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/taselerovatovapusoriponi.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ouqljcimg3irf1p9ub5atk6pa6/jibekenu.pdf
    • http://canadapremiumlubes.com/survey/userfiles/files/10541248503.pdf
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/kuros.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b477a40f17---timezopoderojimudavoxeb.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=live+chat+video+call+with+strangers+app+download+mod+apk
    • 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_off0000f6b3.bin
91b70522a015e3760e771b515568632b12007b10ae013f4626c3614a78aa463f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 17008 bytes
font_01_sfnt_off00012303.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 16792 bytes
font_02_sfnt_off00013b1a.bin
0b7b4982f33ed5a9605941a77d6726edac71018a1d23610944a2eac0b6ef4b2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1A 11160 bytes