Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f3bcea23e59ce7…

MALICIOUS

PDF

86.1 KB Created: 2021-07-13 03:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 95d1a8f66c141d0bc7121cff9588d1c6 SHA-1: d4eced8a308bd21ba96e529e4b3afdec93592803 SHA-256: a1f3bcea23e59ce7e1e8ceb89ee7b3a0eb400c06bc2527d1cb9ce69252092397
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, forming a link farm likely intended to redirect users to malicious or phishing content. The presence of these links and the overall detection indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849531e2ebd---kibijepi.pdf In PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3c986e588---56871308015.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/kabuvarirerefevefal.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/zitudevirelugukowuvak.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bed6b743110---dubaresaxuxikelubi.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-14/20210514202415895785.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/32d1ecd8c469c9623f77df93d046c546/loxizuxab.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/jarepujo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db4fde48c7e---rototuwarigivedixe.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/89627484121.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7fh7csqo1vn59vtcc6vp6g0d2j/vixuj.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d33e17320---19845307923.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16082476d1e42e---vevizenir.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c59405b1052---1228518877.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/62c4c7f0daed8e62e230708090adf8ce/juposotozubelivajuka.pdfIn PDF document text
    • http://addsfly.com/userfiles/file/21470766101.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/5b7a561a198e98d7bca3b1055ba4a6d1/zolume.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef07e3e2d---11755525742.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/pefoxasajesajodukibuwem.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/89480961643.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/r9k0qp5vc6ql5nsbcu0ilpskh0/92965151668.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/20960192950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=lil+dicky+climate+changePDF 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_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FA 10592 bytes
SHA-256: 8b555104b55479f8d5a3ca26878dca8ce72b7ee2da6c4217e6807a3bcd94398a
font_02_sfnt_off00011ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB9 17940 bytes
SHA-256: 30ab12726af130489248e8f6ab088b07dc56ee5bbddea469661d249f5f164f30

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