Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbfaaea3396a6c4…

MALICIOUS

PDF

96.5 KB Created: 2021-06-27 16:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cf23b5567752cb8690b7c577f7edb90 SHA-1: 56ce707e6e3b2155bfdd9e0bb15a6741aea4111f SHA-256: bdbfaaea3396a6c41c63343ae7f06a2b433d1c903cade6a3940e098f585ff254
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware distribution. No scripts were extracted, but the structure indicates a malicious document intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9857

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.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdfa81a10a---rolelinoletesitabisodotu.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fc133f446---wobitodose.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1b21a6c5a52848381d907e6790a9ff93/nasebut.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/bb68cd45eeac62e62d718b686e441716/zanukibudakalo.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4a564d6300dbf3278170629a512ef310/23244255610.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750a5c05531---jederowami.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/37fa7b24d557fd3813c6968f36207ced/79958852046.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c61f3fa0f5a---17420890970.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acffcc6aec8---71555644303.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e5e647b21---13526028791.pdf
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/86780898715.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8cbd5f39f5100aebd49669b1acac3f18/22746659853.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/uleo5dmf86ks87hskgqnhki9kg/tejudir.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9de1eadbb---novojavagivafozakipoworik.pdf
    • http://abw10thstreetne.com/uploads/files/sinetebewurelore.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b07e88757a3---xolaxadatokeregigovemuj.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/aa7tjp3chvq0e002ijqviuh44c/detotovogabaketovaluso.pdf
    • http://driver-jazda.pl/upload/file/kaxidaxexomazeki.pdf
    • http://sola-brothers.com/userfiles/file/43501807679.pdf
    • http://weifong.tw/fckimages/file/jidadezigezenopepuvin.pdf
    • http://aaaexpressheating.com/userfiles/file/14505124366.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/18d3e8662a6e2fd46c2d254082db2855/33918013384.pdf
    • http://aylincinarli.com/fckfiles/file/jigexewodiviw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=abrazo+meaning+in+english
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000109c5.bin
40f52a6f1da07dc1f8da4bdd3f6eac96dd3e0d84e8605bc163b411a551d9f6fd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x109C5 18732 bytes
font_00_sfnt_off0000d982.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD982 16792 bytes
font_01_sfnt_off0000f199.bin
fb848689b0019bde7cf5ee6ddb8adb4ba68e64562552d2e2e722c5d2bc7c7663		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 10640 bytes
font_03_sfnt_off0001288a.bin
a677991539523819f0532855c86b6f99916119eed98a9e2d5410c5056741e6ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1288A 24676 bytes
font_04_sfnt_off000163d5.bin
739f57ff9644408541f6571f7369f9b3fd1c3ea95e6fdcd82f66bbcf3b340526		 pdf-font-stream PDF embedded font (sfnt) at offset 0x163D5 4280 bytes

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