Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9c08f723a79d1a…

MALICIOUS

PDF

101.1 KB Created: 2021-07-19 05:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4725cc18b1dc7e8574ed671b3dd06806 SHA-1: ba8c456346a441f943e50286526d468c9bc24cbb SHA-256: ff9c08f723a79d1a30f735284bbc20f3e96cdf667b345ad6ddc79f1768633cd4
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and compromised CMS upload links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1f4cb49af232bed2ab86bf52f2db3c5/devanimikavojavuzodu.pdf In PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088e6428b727---vifujuvixuzosako.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a71f9664d---pizuwaxanoloxef.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/lijupanixuwojokesifos.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/89808918346.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/89700839396.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/90293421432.pdfIn PDF document text
    • http://remobudostol.pl/pliki/sezawomutu.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/togaxegemevelitiser.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/komuwetolufufidiliku.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/f0b3bf838e4bbe35eda778018e3e4711/wuvira.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6fdc7467---42577720391.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608450de01c42---90070058312.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/vupipuziponosuv.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/23065951590.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/eab04nhbun71ubkfg3s73rcujc/50586469313.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/sscm8bkc824d3a90e243m5so89/furalunegi.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/donutotipetuvelenobemiki.pdfIn PDF document text
    • http://martonelektro.hu/files/file/31424256396.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/71639f27ae43993825727ccb5f5c38f4/wewokudodibuto.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/6156946393.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/sufikonuluxejemip.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160f0ac3253f10---penawekevofubizugoki.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/22631549155.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160768a00f2ea2---87945876548.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/rtok7j7sjgg239obe5p3d10bm8/mapoxawawotijezi.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/wirazoxaxomiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=meaning+of+tolerate+in+kannadaPDF 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_off000127b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B3 18260 bytes
SHA-256: 6084310178e2bc68720280fad4d9a7d4c3a141f2be2b77fe5b9c5b4004573d94
font_01_sfnt_off0001573a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1573A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F51 10444 bytes
SHA-256: 39c175b8bbb1bbab793600e5816d8cce66ad86e66e20534192a858ae560c2cc1