Malicious PDF — malware analysis report

Static analysis result for SHA-256 252b6f3664893a29…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 14:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 109c624e617e827c14a5db25033421d4 SHA-1: 0cfe9d0b81e2619f1c8791509451b6deab0d768e SHA-256: 252b6f3664893a2903350470fe0b27e6fc340d271dd67eeefe2fbb98bfc9a794
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external URIs, many of which point to compromised websites or link farms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=wild+arms+3+official+perfect+guide+pdf PDF link annotation
    • http://duocthientam.com/uploads/ckfinder/files/73691211742.pdfIn PDF document text
    • https://peterdegendt.be/file/13624380064.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a5e68e32e7084b7da9ac77e059f1a83e/levotezabit.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/67350126316.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a8002ef00d8a4be7f19db4de93ad9383/10505188403.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/34438969615.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/43ddba1e017258b2085fb94e676ddc4c/sigepapefoterukad.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3210dd7759ba85efae6845ee72d560da/56883691236.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/tagokofizopekedu.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/ronixexunefoge.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/10343064622.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/9vtq5fntash0aqu6ubi9r17el3/wirepob.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/begipafenuvedekokemoli.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/muworobemevul.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/zodivi.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0db45f53a---mofopirafavomewuw.pdfIn PDF document text
    • http://fittbikese.hu/files/file/84314568813.pdfIn PDF document text
    • https://derfo.info/resimler/files/sinadutavesuduk.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/mcnmet6tiomkj71or72vkj1jn9/nanotisiveture.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/nopevelefagisu.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c3826df6---19259896338.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607450ef4fc93---28766229362.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1628815363265361257.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/29742036196.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF0 18368 bytes
SHA-256: 8f33d1e38fdd87b3c04d4c1e139693b90a29c1598c425cb3613ccc00d26bbf8f
font_01_sfnt_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11660 11124 bytes
SHA-256: 1d83c78996e6f5b961190191c556f5ecdbacccbc420307fc6ffb8b7103dae675

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