Malicious PDF — malware analysis report

Static analysis result for SHA-256 778e2529f5753a00…

MALICIOUS

PDF

93.4 KB Created: 2021-09-02 00:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa7bba7a114a0a5215a7a19706d838ab SHA-1: 9ba1190c6fbd0626fd61970d35d0c218781f21c0 SHA-256: 778e2529f5753a0082faadbd093de711995d5ec8048b68357875668a7da2c103
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains a large number of links, many of which point to compromised WordPress sites or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest potential exploitation or redirection to malicious JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://aedwea.com/upload/foto/tivunupoleg.pdf In PDF document text
    • http://anthonyvienna.com/sites/default/files/file/32805406488.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/08c7ff63a233afdb092d51af0024111e/witalegenepamubux.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/wexipesepolutagowojaxer.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/vidasasuwusimaxizesidisif.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16126d8e35a97d---xibapif.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ef4c6d1456534ce2b378b5c0eba6999f/sitez.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/barobale.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/18288231052.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/478635f678b1aaccc5b4b82a433bda7c/tefofusabuzozimodi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c340538a91d---busufegewisowogifim.pdfIn PDF document text
    • http://domainecomps.com/documents/files/vusufibaxevif.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/2166053134.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/65272964275.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084d52054bcf---rabodasedukexo.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0c53373cc01d7b273010fe919c1d8983/fexifesedinoke.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65a8066ebb---10547113879.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/6323311011.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/vopipotuwoludojupamun.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/816c119c0f8f8fe0daffc002bb86080d/9405362008.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/79553d74278cbca80388f3dd6cebacfd/jiwikejejuposisifowiw.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/59234233862.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/99107431765.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/k9dg5p4gdnkhlkgnk2lfb9a4nj/xatovaxizitunivuvag.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/5d3640714f9d948e4c2317e04ec1be2d/4338032738.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16095f49359b4a---zonijatutuwikojafozilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pokemon+fan+games+on+androidPDF 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_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 10644 bytes
SHA-256: 863830eb4a9ec37d041f5bf41ad8b2a19f87ab156ce67a67251205273826ed39
font_01_sfnt_off00011bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCE 19028 bytes
SHA-256: 8506a1f3ad1cc7367a15cc0b9ac94278e7cfce43c6428bb7481d6311bec153f2
font_02_sfnt_off00014d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1