Malicious PDF — malware analysis report

Static analysis result for SHA-256 857bebd6779a554b…

MALICIOUS

PDF

131.0 KB Created: 2021-09-17 08:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 806f7d097b15d6e1f423e12ff97ff169 SHA-1: da477a12b6a9a6d7e738257e44c619e4e44fe09c SHA-256: 857bebd6779a554bd9c3e8c4589219dfc6ae05d52792eab4eefabe0f22ac391f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous URLs, including 'smidgel.ru' and 'averon.ca', suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://smidgel.ru/uplcv?utm_term=the+walking+dead+game+play+store PDF link annotation
    • https://aspirans.com/files/file/bopadepewosexegaju.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/putarasetabo.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-12/images/files/15248967154.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/jafijetafozokokizobi.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613598f92bbd4---65244169946.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/ludekujifa.pdfIn PDF document text
    • https://fultoys.com/userfiles/76990784542.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/jedasotugukovekemuwe.pdfIn PDF document text
    • https://successalpha.team/upload/files/birusazod.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/xuzawibejusumibonem.pdfIn PDF document text
    • http://hiniceshine.com/upload/gufedus.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/17916661595.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/657a016362eff0999ffc5c5f05a802b9/bibapazofimosikegomuko.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/80738739794.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/fekojivowixosujirowudekut.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613698507d0c2---rusurazidafevi.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/58833047488.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210904_37227ACEE0F9931F.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/273b15356c61ba05e09911b9e25b1a7d/16671048871.pdfIn PDF document text
    • http://lejonhund.com/upload/24556882396.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210910_18ECA54624894E30.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/77690226104.pdfIn PDF document text
    • http://dentherapia.hu/files/file/67952198208.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/71066152333.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_off00019881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B093 19736 bytes
SHA-256: b616224dd6070362f75d8e84411f6c331a194da169f66cfd8968b4d7694bcee9
font_02_sfnt_off0001e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E45A 11096 bytes
SHA-256: c225715073e279fee01198175b002f57282a27acd02c70bc8afb24760038ca98

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