Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f0071d8758af6a…

MALICIOUS

PDF

101.9 KB Created: 2021-07-08 07:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23e4f30004155574a8025bfbd927c11e SHA-1: 951c7ee0e3cc010119a5e4f387f5cd79211dc0c6 SHA-256: 25f0071d8758af6a8f3b79d0939dcaa1652db3185e2bdf248ae7d9a78cb92487
196 Risk Score

Malware Insights

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

This PDF file contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. The presence of algorithmically generated URLs and link farms on disposable hosting suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://forumcutuca.com/ckfinder/userfiles/files/6912829155.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c64fe62aa3---zivenitogemukenup.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/7fdcfca4f8b82c628d335499f7f9b05c/84658206729.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e2eb91163d7250b2cd9be393cd494819/76156098631.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160864b34891f1---76830681280.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/bh78lt0b0uhlg0c9fo274pgqlv/xosupop.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/63819690a76288945ed7085149e69fd4/bidaxosal.pdf
    • http://chouchouphuquoc.net/upload/ck/files/fexotokuzimalizepefamu.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210528_D0830993EEC846F1.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/eb8e7f7fc9596c7e7d15ebe02d8a40a4/zejemazesukin.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1bc3cc796---xarevi.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2567373475---67318465516.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/3b007a9eb950e667f75d192c0a11c877/91741320925.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16076ad2bc3e2b---xijidizavukufiveferef.pdf
    • https://annekienlen.fr/imagesfile/duxanepatarogupix.pdf
    • http://moscowprice.com/content/xuploadimages/file/99670221481.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3da6416fa2---foken.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2aad65698b185ea37b8db5ac3efca927/31128531198.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8555462c80---jazudulawiramifa.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1f5f7a83e3b42e909ae498568b3e8d21/tomutig.pdf
    • http://fouladsazanco.com/Upload/file/zinijezixaxuwuvavujo.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/nbc2ct4l6piodbosb3c449o5k1/funatejirepoli.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a9554840543---46162878383.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=surgical+suturing+medical+term
    • 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_off00012c65.bin
ec54f7255e980115ca81a2bbac1056be88f115da842c381f33c15c40c92abbf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C65 17456 bytes
font_01_sfnt_off000159e1.bin
ee5245c768e7fc6d07bb5e7669e682aa65acfbde387e7d83058b35c23d1c7f74
pdf-font-stream PDF embedded font (sfnt) at offset 0x159E1 10768 bytes
font_02_sfnt_off00017267.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17267 16792 bytes