Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43d1eade4b3d1f1…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 10:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd4ac85508ce7a8fa293a04269031861 SHA-1: 1c8a9d556b5c0391dedf81ff2bf96ab72cd4d4e8 SHA-256: e43d1eade4b3d1f10334d3019c50eb7172145fe015d1961ba39cd67f26b85e03
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF file exhibits characteristics of a phishing or malicious content delivery mechanism. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://branonperformance.com/ckfinder/userfiles/files/63578730558.pdf In PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/3465845275.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/sukixovukasu.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/vorolafusibatamojovog.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/17173744862.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/guledurad.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e85870f903---70398771475.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/78317282119.pdfIn PDF document text
    • https://retta-bg.com/userfiles/75151981014.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/24022612032.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/mlbq2gq4p18norisp0d83nbepa/98223485450.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/86605711231.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210902141806.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/tuvigilirowub.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2beadcc703d1778c7117bd646c2686a3/bupodaxu.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/39796314104.pdfIn PDF document text
    • https://thehouseproduction.net/file/49730528477.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/1540550071.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/saxipidesigudigozuxod.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5985dec5d---29694687350.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/22954950053.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/fulelazugawujamok.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/mevibijimitamaxomamedix.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/40831860876.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210912081337_764980261.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/12026017165.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/putuvazevufofuwori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=watch+hitman%27s+wife+bodyguard+online+freePDF 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_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 11388 bytes
SHA-256: bdb0cd81bbe4cd80e47499a1df2083d2906f2f5c64be0b8b6e2dfe56f8fb876c
font_02_sfnt_off000113e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E7 18024 bytes
SHA-256: bf4ff50d97388292d41106a2f055c30962cd37574ba991889e570209d528ff7c

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