Malicious PDF — malware analysis report

Static analysis result for SHA-256 041dc78e5744a2eb…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 21:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b05940ee4f5e16ef2dbf444ee5d2ccda SHA-1: 769f86d405e252c1f6d44ee0ae559ce417fdf66e SHA-256: 041dc78e5744a2ebfff7f3caa38c9a5369a9203ab81ec0dec160f461ca1eec58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule further support the conclusion that this PDF acts as a lure to external, potentially malicious, websites.

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://chcial.ru/uplcv?utm_term=alternating+esotropia+pdf PDF link annotation
    • https://torbay.ru/images/uploads/file/mizuwedulezu.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///32063407958.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/loxebenanesufalunif.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/vafitanif.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1610d2a5486135---wokuba.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd73906b137---28279220921.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/47701461781.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/demasaleravisekenan.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c0b217b88a385f3691b310da4006526b/sogosatitavapukimigoga.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/duvuwos.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e1a69ab1fa21a7e5899d942c75d98983/raxerowaj.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/5420915581.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/latonadojewilewozibib.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/mowajejol.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3315225dea---33976829169.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/soguwezasa.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/rerumujazanudobujupute.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971d8baa616---kajodopemalow.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/xomosederepum.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/58154125589.pdfIn PDF document text
    • http://cabini.it/userfiles/files/80257130494.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/e93a64913687a1f4a47f1768779d1c02/papix.pdfIn PDF document text
    • https://fasleh.net/Files/files/fiwixebiwite.pdfIn PDF document text
    • 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_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 17364 bytes
SHA-256: 857fcf85f861050ac52fdb0fd3f99f1d201352600129bf668585733486ab7ae5
font_02_sfnt_off0001291f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291F 10656 bytes
SHA-256: f27e9f478d4bffdf20db890f815f3b5f0bd576a1e0b19f37bdff3e1c561acba4

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