Malicious PDF — malware analysis report

Static analysis result for SHA-256 effb7ff092e4f3aa…

MALICIOUS

PDF

84.8 KB Created: 2021-10-15 04:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 3cdbb1ed5750ed2d47ea90de00490c56 SHA-1: 201e36fe2ffd525e4e26a906a2d42ca9cadbb6a4 SHA-256: effb7ff092e4f3aa3c9b3de76b8f01fe311d4f7e9081c1d1cfe1428960415e2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://maftplayer.net/calisma2/files/uploads/totofe.pdf In PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c14dcad9e---mokixuj.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/65174817205.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/911arapblcflj4516fn57tnood/fubokavedasakagupimaveliv.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/13088918653.pdfIn PDF document text
    • http://lawngo.net/fckfiles/4845538006.pdfIn PDF document text
    • http://citlak.de/admin/UserFiles/file/13080139400.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/7a1f5b2e0a5087927e7bbad987d0fa82/11427521819.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/ketogoxupofup.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614be4243f7a5---45068871611.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161652451e5663---30055931799.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/85527479727.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/xosobato.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/kuwexakadojok.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/15038822217.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/devowafujadek.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/bifata.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/57560041107.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/8700816595.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16163ba0c17b92---46631771752.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/suxokumuwebitivuzema.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/24688252010.pdfIn PDF document text
    • https://thehouseproduction.net/file/22523669059.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/oscUj7J0Gjw/uplcv?utm_term=csgo+fps+boost+launch+options+2021PDF 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_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC05 11092 bytes
SHA-256: 6d4c12d3b67a67ef434b5637bbb33bc5adb32c2256188ef89ef243ca74a46fde
font_02_sfnt_off000115a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A9 18552 bytes
SHA-256: 54215ba0724c53c6ed8c2f6db646b2382d714cdaeca8a6562c6b60c58dcfe02e