Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e9f42b664718c1…

MALICIOUS

PDF

90.3 KB Created: 2021-06-26 04:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: efa882d78abc6402a57cc19b55a79e0c SHA-1: 1f016ac1c66c3112e1bd44ff9d35679cf9eb8cc1 SHA-256: 35e9f42b664718c1eb433ed5fa6725e755959c576fe286a0d740cd3aa85a1925
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the file being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://philabc.ru/uplcv?utm_term=java+interview+questions+for+junior+developers PDF link annotation
    • https://pepinieramontana.ro/ckfinder/userfiles/files/pavosoxikopunipeg.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/0307ddea8fe09ebd97f7b068a544cce5/jufosiranufata.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/91268501564.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/75893843459.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bda553de74---tetamikopaxoxixiras.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/518f4dd1f451f3078f6bc2a447dddfe7/voxuwejivapawopudowekit.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/6130914428.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4c5edff831179f15c31a5cfba4e37d89/bobomategun.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/jasazalojetasem.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075975230872---76988280666.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/depinizuferitisa.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b688211ec4---19695264351.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf6b26b18---86454758690.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/a6b4efa5fb4bebf29ff2107c3fce1b8f/bavurifogurobefasej.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/2rqhftrju3mlfvkdgrqptjmlve/momalijobuwudederuxeti.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/4602a10c257c7f04d8e16677d2933fbb/zugalelisirozilerapuneni.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/07a4f7f85c268e0cf9f0092482937543/nopebexexuwo.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/nopegufum.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7fe0e5dfa---togetinukitupokamapeme.pdfIn PDF document text
    • https://advik.net/userfiles/file/nuvumejixadumu.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e45020e2cf83157399ada08b730c95b1/xebifepositilol.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/54rkcd5ve27votnc464v0c11f6/kozufexopimonufowabipaj.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/zuzabazive.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3a06836bc---38186059783.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba85379c8b6---doroxagetonitosixixitax.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/efc6bb66291db42f2c089a62b3b65dc6/68881156544.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_off0000fd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 17044 bytes
SHA-256: e933a5d5e49035124f299b03aeecc01896f6cc7bee2758d49f0bea05d8d7fca3
font_01_sfnt_off000129c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DB 11012 bytes
SHA-256: 5d0b6e631c8fbab01ddf9b9515f5e7547fc7ac43e7254199b7e7195a506197f9

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