Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8dc181c1e99fbaf…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 11:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7a440673c409b3cc379e018c4fbd6ea1 SHA-1: d0b7c4d0f2c759a72eedbe95e51f757beff6130e SHA-256: a8dc181c1e99fbaf15c1a83caec301eb3dceb7b20def184ef9b627c442b2befd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=crc+handbook+of+laboratory+safety+pdf PDF link annotation
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/14189324214.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/korolozabowa.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/97765977457.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/433a5e46b7525c76eb83311710fec08e/tubimogizuvarunatezol.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/hhqam08qu9plbvml9up6e9nmmv/kivepudilisin.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/wujogura.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/c7kvjg1goel14kj3013melld85/7589793385.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/gejedigulitoxa.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5989d2a0a---18069913394.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/93141357993.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/ef2ef9337a151bb4a9916806d21c5548/34396588027.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f7fa5b7ef19---demupamiroz.pdfIn PDF document text
    • http://gewald.ru/content/Files/bujerutejufe.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ea270e83a---53002033301.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6c585afdf---mipetunokokelutu.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/gemijoven.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/kovipujoti.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/94951335622.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/zujulituletomomulukut.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/59291241422.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/jugulupu.pdfIn PDF document text
    • http://labsshop.com/d/files/fufimitaworidufeleja.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/25262311539.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_off0000c1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AF 11000 bytes
SHA-256: ac87facbd5ff1ef41cf8844c91ddec366b02124bbc76b80df4c07553bc679bd6
font_01_sfnt_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 17780 bytes
SHA-256: 15ffda681defd2b0cf4e9d0b0f66532354ba2d2e8c3f5a8a680f826c2d23c15d
font_02_sfnt_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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