Malicious PDF — malware analysis report

Static analysis result for SHA-256 be79e56d52bdc9fa…

MALICIOUS

PDF

98.7 KB Created: 2021-06-28 01:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c977ec038c26a267ea440a4457ffa73e SHA-1: d433a7c7816c39292455ed45d26a91e31d7bff99 SHA-256: be79e56d52bdc9fa0fdce597651c2c315d523bd2a5ca9f8e3163fd8f10faec61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests this document is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9374

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=meaning+of+primo+in+spanish
    • http://nenkin-t.com/upload_img/ck/files/sewovuliwukijebutameja.pdf
    • http://www.kickcommerce.com/userfiles/file/lurakewikexekigak.pdf
    • http://reversetheclocknow.com/ckfinder/userfiles/files/zorureziguvixutevo.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1073ddee1---11594222447.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cad065212---75861533636.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1cf0125c6---dobafaxiboruguboxuxu.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fc65n2v0klfob975ignfth8ii4/ligos.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/jkjo0u9an91lute5f1gqrab6bs/53045375313.pdf
    • https://armenia4d.com/contents//files/52216625548.pdf
    • http://mp-journal.com/media/file/lupunepexusufegilujo.pdf
    • http://dotacjedlaoze.pl/userfiles/file/14145429124.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/461eafd57819f7191304d3882c76e085/kijupero.pdf
    • http://21cedu.com/pds/userfiles/files/kixiwofufujeniwonubaj.pdf
    • http://eko-inwest.eu/upload/file/zoxabesuxuvukomutivamifod.pdf
    • http://furniture83.com/upload/files/lakagetafosoxezo.pdf
    • http://amphorabeautyclub.com/campannas/file/73292717833.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be00ede2dff---nipenugovurusilukizagikuk.pdf
    • http://studiopignotti.it/userfiles/files/47382397625.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609304fcdd1e1---mofoda.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/459e50215188931c8942194e3349abfc/kazase.pdf
    • http://energo-winstal.pl/userfiles/file/vejigumukolijoxu.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ee17e585c531b206587df7cfc8aeee16/6050406724.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608770f503520---11304767954.pdf
    • http://zae.me/datafiles/file/88704281496.pdf
    • http://studio5r.com/userfiles/files/vokusaxexewup.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18dae9eff---zizuwanarutegavuwidor.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010cbc.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10CBC 18328 bytes
font_00_sfnt_off0000e735.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 16792 bytes
font_01_sfnt_off0000ff42.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 3464 bytes
font_03_sfnt_off00012a5e.bin
1762dd78143a173292a3a42c9c95ca26936a74c0136a1c250c4aefdf2477183d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5E 10652 bytes
font_04_sfnt_off0001427f.bin
9d26b3ea27fcd602f17cfde455c5d7c3b494a14bb34b52aa2efc15da65d99782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1427F 23196 bytes

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