Malicious PDF — malware analysis report

Static analysis result for SHA-256 11121b6a3efde804…

MALICIOUS

PDF

91.6 KB Created: 2021-06-27 02:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa67e95f2c44f894928768ec9a6df33b SHA-1: 2154fb2cf9446839285cf06577d2b38b5d4bb921 SHA-256: 11121b6a3efde804830fa701a1bd2fcc1f6bed80f22927b89c5ca3a21bf1f2ac
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://accesoriosalmayor.com/images/userfiles/file/bolujukofirofamojumamaz.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/hf2t3vdr72ccca3umdtsg12euj/viwudejakapumomaruviwiz.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071c50640341---24284491615.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7c711ab5fb94c30a56cf9a820dd8d8ed/25425056900.pdf
    • http://naturalmis.com/userfiles/file/24463406310.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/68793906319.pdf
    • https://snqrsl.quebec/upload/editor/file/warikedekudijidavixoti.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608df345b622b---7001431836.pdf
    • http://tivatijapan.com/uploads/userfiles/file/86485353045.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/74655235276.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61ae576e3a---jawafapenonidomejilogep.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16081db92248fc---sepumidofululozelufib.pdf
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/64720673417.pdf
    • http://sacoorhealth.pt/site/upload/file/71124397092.pdf
    • http://blevy.com/ckfinder/userfiles/files/sewanoxozasutevixol.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d58123d53---nerefetofiwuzolojoledupul.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b96a480317e---dimowexobivakinevokapeba.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c676f9d7c87---9098531400.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/46dfaa4cc0a1eea51968c801e3697a4a/dokepelalu.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/g3a0fdol2g2b5s1ai75ahqfd5m/dilejafibixawenixovow.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2e248ee060d62e9f58eaec56cf0fe788/17653424903.pdf
    • https://easybuildapp.com/files/uploaded/files/32762476823.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a84fb1dbc6---55461533276.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd6f8051d---36716598148.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/cg2f6dhcepcplch784k53gthr1/lajuvekewinoxafepe.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607976481225f---dovoxerawujovivoxonisur.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/pe3hpbfb0f8v1fgjlo9p4rev8m/zenimexenesomitobelam.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=4+causes+of+desertification
    • 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_off0001006e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 16792 bytes
font_01_sfnt_off00011885.bin
2fc6350761db423cac09e1c2594abcafd6d29d920efe4611d814c0e186c14f78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11885 10504 bytes
font_02_sfnt_off00013093.bin
cfe14a9d2ecb445294ff11c3072a883de633b24542d763e35b1d79c73a0660e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13093 18236 bytes

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