Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0678a9ce03f4fd…

MALICIOUS

PDF

77.2 KB Created: 2021-09-09 09:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64f3f9a78f17a7ca25b9ddbf01ab8968 SHA-1: 44b0934729adc96979e7cf950ae5452de62d2ac8 SHA-256: ef0678a9ce03f4fd2ca8def23b94e8a01b786f0e9f37c9c62372ed1fccda9d56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or engage in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wolfgang-photography.com/userfiles/files/giborof.pdf In PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-4/20210904205951602342.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/nogegisogop.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/40001176885.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/kosuvupusizufa.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/pegeku.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/63475974916.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/dalibemikuri.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135096ec50b9---82310825599.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc4abd234b---rapisokewakekaduzem.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613448ec228b8---zunuvipize.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613882a5040f7---vogewakukajoveki.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/forix.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2b3863c4---dawatelapalugisuxi.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/476d4fa8eee88799be468cd84eab7fbf/fogurodo.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/82980197781.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/kepetesufomilarudegav.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/94414823339.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/jarefilolerat.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613984fbb76e3---60391616343.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/80414391966.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/mizabepaj.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210905055500.pdfIn PDF document text
    • http://hijoin.hu/editor_up/fixetekabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=neutrino%2B+mod+apk+unlimited+crystals+download+2020PDF 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_off0000c850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC850 11288 bytes
SHA-256: 0f2682baf370c5bf7e2683494b847bb76113d64cf987d712d457ca45ee9f4304
font_01_sfnt_off0000e2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 16812 bytes
SHA-256: e1c7312bd4fcd8d46df80897bf1dad036ccb25f8b1c624df4859af668a1beb94
font_02_sfnt_off00010ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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