Malicious PDF — malware analysis report

Static analysis result for SHA-256 0524e29bcc826a95…

MALICIOUS

PDF

125.4 KB Created: 2021-07-23 10:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bed3ac7fa7305cb6f2f3a5b8a560913 SHA-1: 41d1e2861473277bf96b7d2df4ce83991a0e2677 SHA-256: 0524e29bcc826a9501748473d7546fa550a202784cdae5d17badea75e28df29d
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other potentially malicious domains. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ladangmimpi.com/contents//files/mitujexijodamad.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092284597b18---25492513679.pdf
    • https://newtop-eg.com/userfiles/file/fumaxekaxosumerefo.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/7b955d06ab3e649c2dad5d3165d3e465/74015399762.pdf
    • http://staractivecollection.com/resimler/site/files/80728769843.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30674d998c---34499112383.pdf
    • https://vieclamkinhdoanh247.com/upload/files/xodowogolojezavigi.pdf
    • http://qctc.vn/upload/files/mujabipogovunoxiduk.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa35eedf7d8---30633547686.pdf
    • http://www.gieskestukadoors.nl/ckfinder/files/files/metalipasuxajefenisubi.pdf
    • http://tuzvedo.hu/elemek/file/88013566745.pdf
    • https://blugarden.eu/file/2859020129.pdf
    • https://euroroma-bg.org/files/file/kixumudotekiwukogigibotav.pdf
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/kobifesejetufota.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f31920088fba22d2ddcc99865ac7d569/9640395225.pdf
    • http://mvhs78.com/clients/68382/File/25242121516.pdf
    • http://amphorabeautyclub.com/campannas/file/95912860763.pdf
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/72957904599.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc91f0901e---jizuxamebalek.pdf
    • http://polimak.pl/userfiles/file/daxonugabegopevu.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e735ec06839---86240763024.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ddb1ebddad6d209e998af6800ac17be5/wividuvaxutegojejige.pdf
    • http://www.parkwaytransplant.com/media_upload/upload/files/22762999152.pdf
    • http://www.moyekolodin.com/files/99328897708.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+ever+would+you+rather+questions
    • 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_off000188b0.bin
76bc76b7f48abded6529cc7ae0f38aef5e2145ccd8def8adb59aa36a57ab678d
pdf-font-stream PDF embedded font (sfnt) at offset 0x188B0 10908 bytes
font_01_sfnt_off0001a1c8.bin
24c9146aa942b71fc3b344d2f06713f2d3d0e1746798e95eb71f445291513a14
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1C8 17628 bytes
font_02_sfnt_off0001cf85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF85 16792 bytes