Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a24204da2a88e1…

MALICIOUS

PDF

72.7 KB Created: 2021-09-02 03:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 05b809191610336bd4200243f59588e4 SHA-1: 6bb885540b6ce39c86453b229527cc7225db1e07 SHA-256: f9a24204da2a88e1b7558b5a27d344b5237c7519a290017b24f2579a62206a39
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent. The primary attack pattern involves directing users to potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/87837838611.pdf In PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/20ae53ece6202f9d6c5bfe936a79a1a1/98853588139.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/65744900207.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/24490148234.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/59736295366.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098170c560b3---xarimanikojibilamid.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/15916255143.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/wusukubirusilowefesaz.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/4391523164.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/91317736441.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cutfq0ah7qvepvoq547d319aa/mejasupalizovezabojelib.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d116dd48c1a96b91e4e83703eba01b0b/siwarulugujorelitaletode.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772067ea2f2---74213099384.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/533440552.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/hht7sbnap8dqhns35rb06ud0k7/36636341579.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/pebonenelok.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/fiwura.pdfIn PDF document text
    • https://asi-filter.pl/files/file/77086960712.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/dc155sb70u8adcgmbkpqcsg3jh/ruxebinexenobanasovimemo.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/2jcrq5mli25b10524slj53pvku/69564022093.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/nakikonijigopa.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/28955272579.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/78261403743.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/foranotudukodukol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=protector+of+animalsPDF 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_off0000bdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC7 15372 bytes
SHA-256: eb26911c2a8a48adc4bff761374f410a2c35ef29509aadf3a346c3d3deccc779
font_01_sfnt_off0000e4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 10496 bytes
SHA-256: aa0bae59f3d04e999eb0169307ead9bb3c1b13746966da52d6c55c850feeaf40
font_02_sfnt_off0000fcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1