Malicious PDF — malware analysis report

Static analysis result for SHA-256 905db2829013bb16…

MALICIOUS

PDF

92.9 KB Created: 2021-07-05 04:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de5610e4452706f694de7879b52b3bf0 SHA-1: 5921c79545b7568b10703079275bfd6a93d654a9 SHA-256: 905db2829013bb16d030cfbbbbe4131692a69fea7636d315a358fffe999d3b06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad48a84972---24707718222.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/fd281bdf8faef0e66ca8028ef34632a9/61892912805.pdf
    • http://vladjurnalist.ru/archive/file/18243565594.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941fe4df0bd---nixegevozufixavimax.pdf
    • http://mistral-paints.cz/userfiles/files/lepukosuzomal.pdf
    • http://antichigelsi.it/userfiles/files/pujugalosus.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/737b4dafe8e5f25b401ec7c131bedbb9/wipenizab.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/36111579028.pdf
    • https://ringid.vn/ckfinder/userfiles/files/83023851328.pdf
    • http://driscollandgibson.com/images/edit_images/file/25520609724.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d8cda2633b2001c247a2004b448c0df/76631753184.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723026d453a---27644487387.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606da12d000b7---forirojovax.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b815657522e---51657749175.pdf
    • http://onishi-kyosendo.jp/archive/98888778618.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/6dbc34a28227c3dbcc48036cac236dad/84582053390.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd19128e64---74660895205.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608797ee8965c---lijobod.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/db487176b21eb8bc1c7265e6927dc52e/velijefifamovekora.pdf
    • http://scard.vn/app/webroot/uploads/files/lesoparotadukojov.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160714f098da0d---31444622114.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66201848035.pdf
    • http://randalljroutson.com/clients/44711/File/zokisonomumide.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54a9f0bf56---62874075270.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=conquer+the+war
    • 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_off00010a41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 16792 bytes
font_01_sfnt_off00012253.bin
424cb33386e91d9fa32b7a7d612eecce89725ebaa8cca91f3aed467949523670
pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 17012 bytes
font_02_sfnt_off00014e21.bin
83aadf5ac627905e5e0ba4f4759f92bffe191e4ea0923b113b8d1d6973b4b6c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E21 10260 bytes