Malicious PDF — malware analysis report

Static analysis result for SHA-256 0901013b5e455a7a…

MALICIOUS

PDF

96.9 KB Created: 2021-07-03 06:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7a5b6a64ac06d229a2cb1104a6c35dc SHA-1: d2248b45c5d5630845103bc4d17d4828ec3949c9 SHA-256: 0901013b5e455a7ab6d95c128aca7dc23d484a0cf16be14e9843bb75f752e51c
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 WordPress sites and are structured as link farms. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary function appears to be redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc94603c3---gezilo.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/dtnkkp29cpeujc5i1p3l3shakf/tipulagevakimodebumuwamew.pdf
    • http://andrelandberg.com/userfiles/file/89836667916.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711f25114cb---rijatasibunajuloxoduje.pdf
    • http://capmar.eu/userfiles/file/newotevepupamijevonumogiv.pdf
    • http://cy2hand.com/userfiles/dimalotopamusekikaga.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/44cifnmlqogb7bmqmkqgg27snv/bifipawenofitokogikuguxil.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/potawamije.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830aa03a83c---4749250318.pdf
    • http://www.chatanakonci.cz/userfiles/file/38583891637.pdf
    • http://agcslohian.com/userfiles/file/fejiwefunidegunumegomeba.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/7256322414366ddcdbe10bc5e533f1f6/34856205258.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825c6ca839e---retexubuvejudeditapo.pdf
    • http://banlinhkienlaptop.com/userfiles/file/25607751203.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a0c85a3bc---15392167432.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16088ad374bee8---gidajejarinorisiz.pdf
    • http://hasici-pristroje-eshop.cz/files/file/jurepinipafeze.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8a4d9f18fb96ea4a5b164644d71a670a/38632269349.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/o2f8k5th1gt984v9f6vm371b04/48032401223.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/d8e9e053b5d2acdffcc8a9643253582a/pikatid.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/ace47fda2ef1ffa931c9da8e44675b97/zibolurogafilaxefesopoz.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/00c1e4036b4a712f78d49a99206a5603/tazelenovekaparawabufapu.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c0194636a---rorotulenixujuz.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/4c1fe4b132c1e94433a0b31b5b029e55/21282620995.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=tait+well+drilling
    • 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_off0001189b.bin
848ac357351d5e8ff977fd124c4057e2f0d135235916e8eb055aa4c987019298		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1189B 10184 bytes
font_01_sfnt_off00012f57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F57 16792 bytes
font_02_sfnt_off00014769.bin
128542b6e3d0dfd7738b0e44184d888915cb7c1a6d9e615bd8336b4dcabd5652		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14769 17800 bytes

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