Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff12e7d09afd013d…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 10:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0891a896e4802167bcbeefb03b63bd88 SHA-1: 738542679d4b24284fd5b711979c80761cb6009a SHA-256: ff12e7d09afd013dbe696e47ce0116a57825ffde48a9244abec4191ca795a540
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to various domains, some of which are associated with compromised CMS uploads. The 'utm_term' parameter in one URL suggests a phishing or social engineering lure. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://smidgel.ru/uplcv?utm_term=control+panel+on+android+phone PDF link annotation
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/36094581204.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/zamuxivozase.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/lovija.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/bakupepalofe.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d1d97ea8---47527169991.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/dusufabavagudob.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/xijokuxulegivorutipi.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/26552296569.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/4660760435.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb6495dd04---52348152105.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a4ed8611---69389645355.pdfIn PDF document text
    • http://wuchem.com/upload/files/20969023418.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/7616490258.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10376055054.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/romikegu.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/57528548091.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/xosunigikawede.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/luxafunalos.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/rosuzixegar.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_off0000e121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 17620 bytes
SHA-256: ebb1be5e99ff64fb324664c0b2a45ac8466e6e8e8230e0ce9334ae7e1c379f3d
font_01_sfnt_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 10352 bytes
SHA-256: a0446a3a89c69917f5107fe1ec4f2cd13a915205638d4ba7f9e93154ddac8798
font_02_sfnt_off00012683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1