Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec655679c769ef0…

MALICIOUS

PDF

96.7 KB Created: 2021-08-13 04:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 039cc3345211a031b37aa94b5956e388 SHA-1: cdaad1f5997d40f814960e95349856dbf83cd17f SHA-256: fec655679c769ef05339347be7277e6ca0efa5267c53d1814b4b1e8cfe4de4c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. Several URLs point to compromised CMS upload directories, suggesting the PDF is part of a phishing or malware distribution campaign. The presence of link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999257748f3---bogizudufanifukenapa.pdf In PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/4d304543ab5b9e4777742b51d411f308/4933511270.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c145303ec5e---vuponuvemi.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/panawofilivatesuted.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160878236ad343---2597984807.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/7295526256.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/jaxomapi.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73721e4949---bopegaloxuraduguzer.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/jkopamorl6oprpi1eiji94tedo/pobirijalolebukogikaduw.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/26886491223.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/facbaf87c7008df1ad081847b42cb45a/37266887602.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/penekijosatugit.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864d7206bec---jekovakuzakut.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/revovuwipodeg.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0976ba30b59091c2afca52f95c31509c/dapudaxiweruvupafesi.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/xubama.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/merawopitezalisuze.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4bcb53eb150ade4a60e4bdda79045b5e/7689218999.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610bf34422179---67885546826.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/a8v0o9jtqsgl9b9ju5k36i9hnt/nulinavewura.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/roguxipos.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9bafc8c5ec8da8d0d25f31dec3fc8c3c/41785060947.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607836536e43e---69309458838.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/takusos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=who+all+died+in+the+promised+neverland+animePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 3488 bytes
SHA-256: 0b2d1c2b0af0f735408c24944cac10ad403c31834ae8e5ad59e37056f5e94c61
font_01_sfnt_off0001128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 10716 bytes
SHA-256: 99f2c3dfece01a1b882febf34b59d45aea77a8b0bf3db17307b34edb4bf1e6ae
font_02_sfnt_off00012af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF5 19012 bytes
SHA-256: b4c7920e6e157e3cd22b602122c4610116a346b61f0aa0ee7c8000860e852eba
font_03_sfnt_off00015c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1