Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdcbe11158e5bf25…

MALICIOUS

PDF

85.3 KB Created: 2021-06-26 14:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03696dcc59dbc1ff9a10715e517820e6 SHA-1: 810beab35100cc5f464bb0b21e3788be8260f1bd SHA-256: bdcbe11158e5bf2567f6ebfd8dfa04fcd3c1825716fd8a529131195f2a14405b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users through multiple compromised WordPress sites. The primary purpose appears to be to obscure the final malicious destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/l1cc3113bkhi72q0j70fggqm56/93479343874.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/t3boqshnekdkdrum2m9te69a74/49177876362.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4a9955b7604fecb5df709e0e2a2290ba/66246701786.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0d63f9894ff11f76c98272fceec45e2a/63194401296.pdf
    • https://delphin-bau.com/ckfinder/upload/files/98228314031.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210604030536.pdf
    • https://acronimocostanzo.com/userfiles/file/71996546727.pdf
    • http://geologicatoscana.eu/userfiles/files/rexajuruzibezepumab.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b39bb4b31d---63820767048.pdf
    • http://stjconsulting.it/userfiles/files/29192102723.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/55147311794.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/gmbialuhaollp1mucso6t41k13/32366277118.pdf
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/saxazafux.pdf
    • http://quickvideo.nl/userfiles/file/30585769950.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9668b22c0d5e5b9ceb705b8d818499ca/15017318309.pdf
    • http://domeinbeverdonk.be/assets/files/file/nezaxovesegit.pdf
    • https://stratasphere.online/userfiles/file/57422424988.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/5ecc2daaf78556386174734c971bda54/27262248458.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088f1deb80c3---tekuvokozogi.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9433562d4---letijarirumuwuje.pdf
    • https://kingwaterpure.com/ckfinder/userfiles/files/92464596519.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16090bebebca85---kevemex.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0656f2b944---dofojibemud.pdf
    • http://usaoxin.com/userfiles/2021-5/file/mumovumupenikewilewofa.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31937f0b5c---74752396011.pdf
    • http://infinijewelry.com/userfiles/file/30602885442.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=another+word+for+grotesque
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 16792 bytes
font_01_sfnt_off0000ffb8.bin
5711bc8c9580f04f496a358e2a797b8c0be075699263bae97fd41682bf946d4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB8 18360 bytes
font_02_sfnt_off00012fcc.bin
1b137e2648d23673d495874275399a166cd8a5f403c4049b6a994c3e4d7ef5c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCC 10648 bytes