Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d02dccf85f6f93…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 01:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 80e7de097bf288ec56d080a4cced68b0 SHA-1: 2b70016f7c5adc9fe1f36939fbc6d8e83e2fe2ea SHA-256: b3d02dccf85f6f9373b0972e484193f718b4ed7e77b1eb0f9d82a486eee18b60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files or redirect users to phishing pages. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan indicate a malicious intent to compromise users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a94b8190656---jalabukufagesi.pdf In PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/kirumapirew.pdfIn PDF document text
    • https://agermag.ro/mm/file/bezose.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9ded24658---30804349054.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9095650476.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/mufififobajanej.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093549f24734---1677495372.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/suzedufak.pdfIn PDF document text
    • http://platcometals.com/images/file/duwonupaximifokarapekojus.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6gvi91if08qcar1f0pieh5jt47/kiwegonokojawajin.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6ea917cf1---seduzepiti.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/23911730106.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2dc0dd07f---24908888508.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/20381182674.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/segimovizip.pdfIn PDF document text
    • http://protok.pro/upload/files/sixodanukowot.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071b246e59ce---zapezawul.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/41680772547.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/53141951380.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/85932985136.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a042a73d00c---turudomotisetezum.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/52696801801.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/tijitujofegakivusinufu.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/91220847695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=programming+languages+textbook+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 17764 bytes
SHA-256: 8cde3f64692f5d7fb09cbd9cf19ae1f934db8d854a6d8d2a8e73de16775ac05d
font_01_sfnt_off00011409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11409 11276 bytes
SHA-256: cab86a1560648bafe70c99e24ab24cc19a653ef8f82ad99ea2c85118342174fc
font_02_sfnt_off00012e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1