Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b9e0f18e210bd5…

MALICIOUS

PDF

76.9 KB Created: 2021-09-02 22:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 270d249e67b9af0c685ec8d3c209b8df SHA-1: 8dd4d46c6c250266c8e4b7680a40e65662d4a469 SHA-256: 43b9e0f18e210bd57d5caa0bec7a8258115b2d5319575b137cb70a42528052ad
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://mytopics.it/uploads/file/pekevigaduxemij.pdf In PDF document text
    • http://hkacca.com/userfiles/22473331504.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/16163214331.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ghub48mmht1ain9d10bckkddf0/8054402121.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/radiluxijuxegavapi.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/mulopemikirebupovubuno.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/43ku64mao4ctduj35phuo9j7qj/zodowazafizufikapisiwube.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/pazadezoka.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/wapoxunabuzizo.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/wurirefedirugavolevibi.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/joohd0mjtt4hmsb66j756n7dbn/gadejofixinodedovexap.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/24779778767.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609343052dfd1---27663459956.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tg9t8f013gj7gnvqfrt1kce5f5/rafozitenalo.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/42815582050.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/56065932587.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/62152517969.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/pikavoforebexa.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/zijexutamalam.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/14406111767.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160907757e82b3---59227767746.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021071322490880554.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607df3f248200---89519499887.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/81625657258.pdfIn PDF document text
    • http://jucal.es/images/file/6465538867.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/9ef5098583a0b09f5913d220e9b49b23/geket.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=bernoulli+differential+equation+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC605 18088 bytes
SHA-256: cd7d9c305bac80ab55b198039f76bfdfc51d5cae8738bab96989c288469aac66
font_01_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 10624 bytes
SHA-256: 37c274b6d63dea112ef4aefe0ff4eea9858a780f6674c0420b6edbfeed9c66d0
font_02_sfnt_off00010dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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