Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aec9aada2d9be52…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 06:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41028f4fea58438a1ba5bea20621276b SHA-1: 519ffcc7b822fc2925abc825cae58d8fb50a4c14 SHA-256: 0aec9aada2d9be5212224f69a5daaabc944db521bf62b7d9aab16ce15c00a4df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=microsoft+emulator+for+android PDF link annotation
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/d3va1a4qqffneecag2p2eh3mvv/66110902757.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/jenimavowamisivupexo.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/8892733014.pdfIn PDF document text
    • https://bdata.vn/upload/files/sajufugovokafuzonalimil.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/96144821272.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/7e3d1hsn20adq717lrl9uo5pq4/61306199990.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161316fb86b8d9---82785995633.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/tozuvusazupogofifoxemer.pdfIn PDF document text
    • http://rilta.net/userfiles/files/54115213752.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/58696851933.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/56041047389.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/jolezoxebozodita.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210913165647.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/butuvegebizafafumowax.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/66498645908.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/gijoxuresejugobugarem.pdfIn PDF document text
    • https://finliz.lt/i/File/sagixofevibojari.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/15117159951.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/70423022599.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/37047167344.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/penakajupizujuvador.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/rasevitudobadusivexeziv.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b63c440f58---ketiwo.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_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 17788 bytes
SHA-256: fda4d5c968fee70eae8156db6b1eb73d624b51345902afe9d5d30664d3df4642
font_01_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 10728 bytes
SHA-256: f0d81cabc218a5433742de44ba48d6bf6f1e17f4693bf9e01046eb07195b698d
font_02_sfnt_off00011e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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