Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa56767445c7dc69…

MALICIOUS

PDF

80.7 KB Created: 2021-07-03 22:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0bd1d4f000f8086b6ffb89340b8c8821 SHA-1: 3f4ced6bfc49ab28ce07c6a489a43d8520c4bb51 SHA-256: aa56767445c7dc69d37f4e581232af3a1dad96e5b64eb8ec4e7f99da3b7353de
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to distribute malicious content or lead users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/3098bbe255671acc04814f99605abef7/55666525534.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/1597c4a218a5c72886f921ab22af053d/80388987736.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/ebaf2e7056f4581e54654c3e554cfe56/96235972448.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c895ed2735---gofiwalaxikivip.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8atgh81ugri624fihnom5ppja1/17810423549.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/te9eqms2hq09uunhh447e9ne18/26583233663.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe2ffa8a30---mudifek.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608460fe14a6f---2505154271.pdf
    • http://musorcentrum.hu/files/article/file/gupenupugepe.pdf
    • https://kham.vn/userfiles/file/72922614970.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/misajivatelok.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/72c188ff46b744294b776a30559f3d91/nijelileda.pdf
    • http://j1medical.com/uploaded/file/4408760477.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fde93f4c2---39056526875.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7054b3a28e---buxalesamoxolazonopi.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/764409b3974709c612a49c55b8a50d19/53753615849.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/tc8b9fmq5gpsst1s10n9qd02pu/89720150249.pdf
    • http://logisticsnetworks.net/ckfinder/userfiles/files/xakokuxurikare.pdf
    • http://ibtaker.ps/userfiles/file/1358829539.pdf
    • http://hanarotalk.com/userfiles/file///subederizulimo.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ffaa1274c4ab811a0a1156d697af1e6b/borudulibaloru.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a51e6ad1f---81994120926.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c513aad41---50705325564.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa160d8b63---52268549797.pdf
    • http://baigeleather.com/userfiles/file/wudemijufukeke.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=meda+in+english
    • 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_off0000d7c4.bin
4bcdb4f9424d2f5b5481ba0689d1432cf941cba0b8cb43f283c4526fbb178dec
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 18512 bytes
font_01_sfnt_off0001074d.bin
bbb14233f3be1a97f801995bd3981dbd68aea6b0e15ff332ee1d335b88b01d3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1074D 10204 bytes
font_02_sfnt_off00011dcf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCF 16792 bytes