Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f14ffe21d75bf7…

MALICIOUS

PDF

86.3 KB Created: 2021-09-13 18:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 850fd5a5bb9c23354f970adcf1f64016 SHA-1: a171c42bac343f7bb1c368b126ace6079005affd SHA-256: 59f14ffe21d75bf7d98750dd49213315dd00e86ca149c3932647a80b44565bee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised WordPress upload directories. These links likely serve as lures to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131b68c3f969---kumawokexedaxalanobe.pdf In PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6407944d5---27042422358.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/xusexobeludimisewika.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/uqao4ann4gbnr8hdejodlajlg2/tezikumugabujuf.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/1395139820.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/7879287433.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/34704909844.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/38639951763.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/tawudubugim.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/xafevupewazufu.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/79980551318.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/mevozos.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/momejotopobonone.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/lolenirukegivad.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/vonaremibajuzazawuro.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/22866096819.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/xulinopidasunefog.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///konafuwutigazeb.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/towelejujolegizalixumidaw.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/nozodutufaxoxujovofojib.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/raxifulogevebexe.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/70252087945.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/dugubo.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/86391500390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=indian+idol+all+winners+listPDF 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_off0000ed89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 10280 bytes
SHA-256: dbc03d301a642c6769a6e2af33b4a4dd7220a07923a4a04f4991aeb1d3fe0ecf
font_01_sfnt_off000104d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 18020 bytes
SHA-256: 4633aae07e9bbe5d5d864028e726ec9b3f21f865d65e931654a0b4e9843a4968
font_02_sfnt_off000133ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1