Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48d5597a6947353…

MALICIOUS

PDF

86.5 KB Created: 2021-07-23 09:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1ae9b9a8d146d7a2c87d789f2552461 SHA-1: 0127cf9264e8da6faf5c2441dc0ff17505f041fd SHA-256: d48d5597a6947353958203cf2fc49177d9b2f530d2f04cae57052a9dda3f8a35
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external links suggests an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://ludifrance.fr/userfiles/file/butujoralatewefotelaz.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/46365078706.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4da9b16f584045caf24ad449c5f4b377/86031957059.pdf
    • https://abugfreemind.com/userfiles/file/mukilizine.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081c70b3341c---84814127379.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/500004edd73ebb38ed0ff245e9ab6997/58002580938.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/802e9aef990bf4b5e00886025b17cdae/zatuzuwetefapila.pdf
    • https://nmcs.ca/userfiles/files/gumasedokenulatosa.pdf
    • https://steklo-shik.ru/userfiles/file/kobonododejilebogupu.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c771bc0905---sufapurenipanuk.pdf
    • http://sharise.net/Uploadfiles/files/fewopumupi.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607126fa9d02f---90468706934.pdf
    • http://asokmontridental.com/userfiles/file/vewepoloxe.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d739caad---35868252806.pdf
    • http://coffee33.ru/archive/file/vowafamofoxi.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/wulemeketok.pdf
    • http://championshipsportsrings.com/clients/23492/File/34448694928.pdf
    • https://meganimal.pt/site/upload/file/nuruza.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/751aca3c443f49fc10576b3fa9f35592/72213052402.pdf
    • http://ji-tien.com/userfiles/file/kulanurujizivuzosi.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607481c645a07---bukarizanikitesewasafem.pdf
    • https://psychologgia.pl/Upload/file/39777482490.pdf
    • http://allamericannursing.com/userfiles/file/nerajet.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c666ca4514---fejaluf.pdf
    • http://xiaohecollege.com/d/files/vodatutekebosamataf.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/578sd6ddmgjbc6riel9neon840/23231832306.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=westminster+shorter+catechism+pdf
    • 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_off0000eef0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 16792 bytes
font_01_sfnt_off00010707.bin
8eaf8192f3606deb04de3148bdff34021e27e7eb9c3f51b4e35dbe534bff7967
pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 10832 bytes
font_02_sfnt_off00011fd1.bin
7b1e9664b334be4ef529d9c1a58e9860041e049549d34aa25a789bc8213863fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD1 17236 bytes