Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19b1c6920528885…

MALICIOUS

PDF

90.0 KB Created: 2021-09-07 09:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf0a3e3a3752eff92832392e575a4723 SHA-1: bd881d20fac0c01b80ce6dd70d35c920357bed69 SHA-256: a19b1c692052888504fbcd1af93f1de17da4982bbd27277440abdd5d5832ecf9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to direct users to malicious content or phishing sites. The embedded JavaScript, though not fully analyzed, is a common vector for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=gershon+winkler+pdf PDF link annotation
    • http://shuswapladystriders.ca/userfiles/file/godavefuxafamakojad.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/tuvonodikejisigokowedu.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59bf873435---75183686721.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/xexokabijav.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f760daac58c---95559199997.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/betubataga.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/paravusi.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad794b3bcde---nomijuxakixozejuka.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e63e17d73a0---kusinanojivesuzawowu.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/9hkv07el1v79ftreesrbc1em72/sunomepujoxobekureven.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/neburazoziretawolumoviwu.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/milejurov.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/tadirubegobakejik.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/fogumipaxujavoxoridupa.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9aa89acb8.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/62939041871.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/lawunukov.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ab4b23231cddcb3b5ef258f60a11de3e/dedan.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/wewoxos.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/roluzapukemekotemolomelo.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/pamiwamimoxefekapa.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ef7d478b07c44bc3c02d48e9478b0845/gijotidonu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1b2304c8657b075303cae38b3e28d1f7/vinakuge.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/96424763052.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/sixiz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 10552 bytes
SHA-256: 5c81611b8cc4100a68cbba616f44c4c5d8cd7c96ce36641a029689ac72b526fd
font_02_sfnt_off000110f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F4 17100 bytes
SHA-256: 9e1c91e1f758fc7bc19dce87525ae860ccae26f75a269afe5a71e6dab4ca7769
font_03_sfnt_off00013d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5C 18176 bytes
SHA-256: 6a177d391695292d2ceedf5de64eac9c80677d7256d204a582fb042a361c84aa

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