Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc1b8d037ff5766…

MALICIOUS

PDF

94.2 KB Created: 2021-08-30 17:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bf4815d1317deff5b0ccf0add30eb1d SHA-1: 274109b597b3dfdbdcb50bb39e9034ba4fa0a59e SHA-256: adc1b8d037ff576686a4c223be9ac14a20bb0d35bb1ee97123308e0431c51ad8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream and a link farm pointing to compromised CMS uploads. The PDF contains numerous URLs, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of external URIs and the nature of the heuristics strongly suggest the PDF is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://pistant.ru/uplcv?utm_term=project+power+movie+free PDF link annotation
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6903fecdd7---15978078858.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/cc2bfe5a91fadb202a71a60dadea891d/tekofopuxekigoperotefeba.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/77777409695.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/45631227007.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8d8a7398d01348513572852bb21050bf/konusulizobevufel.pdfIn PDF document text
    • http://vhshf.de/File/20513415087.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/91788245403.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/mivirujezuko.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/36927219647.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b7a3ac3f5---93647034096.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210730_B95562CA3A8DB2D1.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8ab9c9c2e271e0856229975debcea28f/xokerunijijule.pdfIn PDF document text
    • http://gibisch.com/files/files/maxovisawonuj.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/gosokalarolej.pdfIn PDF document text
    • http://groupkaishan.com/d/files/42705862481.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a896fce7983---78432443395.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125ede750944---9588983723.pdfIn PDF document text
    • http://atomleasing.ru/media/File/nabowaruru.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2d1d1adbabcbf76c7557c07b454cffa1/49152399441.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b7ca9c6d2---95031655664.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2275b29605a42305fbd200f5d77a35b8/72553339920.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/38653459060.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
stream_007_off00014f04.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14F04 17816 bytes
SHA-256: 95242bde46743e9c6da8cebc9ab51b95d7d4ade86b159a040d92cef81f4c504b
font_00_sfnt_off0000f0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 17908 bytes
SHA-256: 4907cced7d083f3180dd99aa0b3e4e202c3f69f1319c60a924a0623ab12c1dde
font_01_sfnt_off00011f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F39 10444 bytes
SHA-256: 4b48c5988c583222a2b52b991cd5bd10d29fb5cb58828abf17a8a439c394c90e
font_02_sfnt_off000136f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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