Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbf2f57cb387da1…

MALICIOUS

PDF

76.0 KB Created: 2021-06-26 17:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cac4204c7bce80bbe89b1258c724c092 SHA-1: 46606196757bbc4c9c8b3327193f49333ef9395f SHA-256: bbbf2f57cb387da1e30012c3a8db140d877f9ac9d1c6c6a3ae8eb9a4d93075c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://centreforeffectivecoaching.com/media/file/vugimedonise.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/19f661216eebfd7b4a3f5a844e9a6f5c/vikavubitatunimuzoxagegov.pdf
    • https://bravo-hk.com/userfiles/file/zunaxaxun.pdf
    • http://kulturazebrak.cz/userfiles/41077260478.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b4862ced---tepidodudexesuponifub.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a1d44942b---98429748609.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd397ea102---93077150464.pdf
    • http://bogelaipigeon.com/upload/file/muzitiwesativagexejezi.pdf
    • https://an-professional.ru/img/files/file/28890145758.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddac8b7800---59031983429.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef69084abc---76663322552.pdf
    • http://grandchainfamilyfoundation.org/clients/85333/File/58375889146.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/805792dcc6e0ff9530962a234f35b758/vikukitumiwapalon.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/aceedaffa23cc91de7630ba4798e8ce4/sopumisu.pdf
    • https://masukpt1.com/contents//files/91022964744.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/6d499d77094b4e71866025d54d22d13a/gebejenewe.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b70d76ce54---52890538382.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46ebf111f0---77867349238.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160849b51c50ac---taxeletomekotoviji.pdf
    • http://abwingssuffolk1.com/uploads/files/safudofexamuvina.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/19653c943babfeea9f4a81fbcfb8594b/88298560944.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760f53c82c9---94087621989.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/71250547767.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=watch+indian+movies+online
    • 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_off0000c75c.bin
2076fbe610b2ef1ce78d680c238caeaae392df0fe05cd9f56785384342eaeae6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC75C 16620 bytes
font_01_sfnt_off0000f285.bin
fda9eb12d0f5ba87941a59953964a95741f6fc21aa554fc567718e00d6fc7946
pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 10596 bytes
font_02_sfnt_off00010a9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 16792 bytes