Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5e7f15163b5305…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 13:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e54152fc0373499079ac607cd0c7470e SHA-1: 5ecd38669240173ba368fae99bdeb60572ade465 SHA-256: ac5e7f15163b5305bc5ca0c6201e2df0da891381b306b0e1a69f759725cfea80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=the+outsiders+1983+full+movie+online PDF link annotation
    • http://bafiti.com/sklep/userfiles/file/46352215189.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/vojaganagegewowuw.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/22027195096.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/wudulozenimefupozigepin.pdfIn PDF document text
    • https://digireg.com/upload/dulivede.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/zikizazejopeveper.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/39125298161.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160715341a132f---76229809659.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/17091273802.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/11257135364.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606d98f95a68b---jurexedo.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210829112405.pdfIn PDF document text
    • https://2acontractor.it/images/file/97188033636.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5afaafce445fae1f6dfad5bc2f363ff8/nubegudev.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b396139d56---1305153793.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/1355328934.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/mogilesa.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/50792287140.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/nudide.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/109c4bddd1545d388aeaae3780cc0dfc/90041452237.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/6803617737.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/tudirelitokos.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa2a664de---jupedukegolejuwevimiwo.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/19bc4ba606d3fb1c966da033ef6f327b/18794063456.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_off0000d6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E0 11184 bytes
SHA-256: e7532c5444aca6e8fc171f55b9ae60139f62b1abafcf1c39ae81272a750ed28d
font_01_sfnt_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 17880 bytes
SHA-256: acb9df322d5853fc7e99912c7195a6cf6bb7e100dacee488c84e67c50d007659
font_02_sfnt_off00011e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1