Malicious PDF — malware analysis report

Static analysis result for SHA-256 3997b82529e513c3…

MALICIOUS

PDF

103.5 KB Created: 2021-09-07 00:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68fb1c455a222a101c440eabe8e9a330 SHA-1: d4079502a43929b88d3b2d02cd581c14cc2fd7c7 SHA-256: 3997b82529e513c3deef189f15f834ebbea52863c225f5c50111ffecdb026ce5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The presence of these links suggests the document is intended to redirect users to malicious sites, likely for phishing or to download further malware, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acef40de671---surujomopewol.pdf In PDF document text
    • https://best-label.com/upload/files/pemarawujiviputesosidawi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/vblsifln6cpj77q3dnvea2vlm5/lerividezawu.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/ad02540ae494645c26e46d45f8abb1ab/kefodomavopejumi.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021052517341373499.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/palazojefitidex.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607049c564e70---6658273172.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3590a8b6f---42651046518.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/zofebove.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/743baecfe6d768643b1e082b12ed4038/dorafemalejasapekuduranof.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/bupewotefa.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/66920176937.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/21657267709.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/miralukovu.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/tiraneruxig.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/vowigale.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/113bf7e060cb26efbb425b9f7d1ecdfe/jasikom.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/fikakobejor.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/26274642604.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/99634199835.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/82442222491.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/fomudomiwosudiwatu.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/922142c8e5e96bf22c880f55f098f36d/ranisinatematesumaporen.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/gelinixim.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/moroxotigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=verset+biblique+sur+la+sanctification+pdfPDF link annotation
    • 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_off0001257f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257F 23120 bytes
SHA-256: e0de25410116d1047dc22deb744559dac0a60ae65a5e5ed635cf0cf3b47c523a
font_01_sfnt_off00015efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17713 10968 bytes
SHA-256: 5769f94ee57ef342b0e28631b3966abda72bfa971f4355a5a40003f0867fb283

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