Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4a96bd1543d040…

MALICIOUS

PDF

81.2 KB Created: 2021-08-08 00:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2673f115fdcf0ae25a09c297b9bff8d8 SHA-1: 123ffa19ab7c0f20d9a7fbb74c875abba8d916c4 SHA-256: dd4a96bd1543d040aba9081abff040c56bcfee6c37422f057b37e225732bdc98
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/qng8ph901l8273j0tmnavsdhil/folagol.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/337ed26cf57785abe2047ddf4483e669/teduxuwuravomonubato.pdf
    • https://daaeportrett.no/upload/file/55508807190.pdf
    • http://chayka-svg.ru/files/rinovul.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a87d7d465ba438996563831e84ccbafc/47787580640.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/tiq51pf01pallcgudrr22n8nf1/67447958454.pdf
    • http://danies.ru/ckfinder/userfiles/files/13507200533.pdf
    • http://thuduchouse.vn/pics/file/72838257635.pdf
    • http://edanieltour.com/FileData/ckfinder/files/20210617_B4F70F5DF17591B8.pdf
    • http://vizcsap.hu/files/file/zamonusiterepoxavoga.pdf
    • http://meteosputnik.ru/userfiles/file/nosew.pdf
    • http://fipjp.com/userfiles/file/gavuzibobojag.pdf
    • http://groupkaishan.com/d/files/55693589335.pdf
    • http://mjsolankifoundation.com/fck/imagesfile/gokuduwikapijetisu.pdf
    • http://autosoftware.company/autoresponders_images/files/90139093290.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/189d8d36aea2c560b5c3130a9e65510f/75974898962.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/52818685410.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b99a2577d19f2dfa6ffced668a415143/48555049099.pdf
    • https://betentour.com/sites/default/files/file/bojuzogabexa.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5256a923---ditajudukukaliwemev.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8928125f8d---93602045620.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d4b9d28c3---zubikobigofasivodon.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713bef98098---63424642388.pdf
    • https://itandem.net/ckfinder/userfiles/files/midebamu.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/278a560c3d8683c551c45f4dac312978/82274557691.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=autocad+2013+product+key+and+serial+number
    • 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_off0000d848.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD848 16792 bytes
font_01_sfnt_off0000f05f.bin
25e5b7c70fe81d42ee5f5d27d6539dbc4d73806d679fefe4cd2cf864adc51281
pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 11568 bytes
font_02_sfnt_off00010bbf.bin
13e86c41be6c0607e692491a5bcb1b4850644d322c654a102cd7fe7b3189ce54
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 16588 bytes