Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a891685bf62288…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 01:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: caf0e5d0e01869444e4572a1cea99433 SHA-1: 9a94bda32ef904fffb0f60257e8d1491e26def01 SHA-256: e2a891685bf62288213f8f785c0d8d47c732d6c8aa3c678f4548bb3ccd2eb1c1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d5784fe86---zijipijegovejumofe.pdf In PDF document text
    • http://mariopresto.pl/userfiles/file/wixupotevonogikekurit.pdfIn PDF document text
    • https://solturism.ro/images/file/69919479879.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/78002131260.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/91674c44537a0ff2d0815808b133101f/nuxofezogunumepaferazasej.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161089185c5ac6---luxunilimuwisilo.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/41519596536.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a32fc3aef3---59190210538.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/1734cb828675a8ced90f205bb3e7e86a/setitinafame.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/nipajewi.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/pirapidusapuzegomizaxun.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/jurolivoxubitujev.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/duwar.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/95494678453.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/64355293641.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/b36e8a7e8d3e3a139c0a109a262003b0/dixapimusamadeparujowajul.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/tegisur.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/246419eb7255d0d86b5fca746257eb05/xusasobanak.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/3161613688.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/losiru.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210702220700.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/fi70fubjfqk8j3sdutidgaia3t/5425028602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dynamics+ax+tutorial+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_off0000cea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA1 19784 bytes
SHA-256: 86803d644c1833c15bb4eb7e9aa18fd2c60872368f93b14ece802362cf5c3534
font_01_sfnt_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 10964 bytes
SHA-256: c6aa5580c4caf8ce8ecb46e717da2397b6506eb662a845777f20ea6e9683e978

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