Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda2f5999c656008…

MALICIOUS

PDF

86.0 KB Created: 2021-09-13 04:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a54609e55126c4ac8b884a8c8f497d9d SHA-1: 377fae959a1d863abd7753a5ae101df7c7cb958c SHA-256: bda2f5999c65600851748f6308784192e3d8418189dde0da9f9222e9197e77a2
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress upload storage and uses a 'download button' lure. The embedded URLs suggest an attempt to redirect users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mcdelandes.ca/uploads/file/surekidebumonexamuxa.pdf In PDF document text
    • http://modernplating.com/userfiles/file/15951275242.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd190fbde6186e308fb06ed11ad18848/79346997539.pdfIn PDF document text
    • https://suruburi.net/mm/file/raraxexoxed.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d3200db6c---77561383833.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8c4ab30ee---rijovizujumopa.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/xefusipovokonokidoj.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/47107758144.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/19871650950.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136140e724d4---gasesajaxabovomepoze.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/94398496260.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109031447293950.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/87843421796.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/vuvujupuroxiwugumov.pdfIn PDF document text
    • https://cooperspick.com/files/83699047614.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/38578527683.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/22132137474.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613887fdc9d38---25670303667.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/gibipikudumerijuvow.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/wukogakewu.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/wuritimaxifinafatek.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/megototijiberuzifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+iphone+keyboard+for+androidPDF 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_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 10764 bytes
SHA-256: a430a8244179790f7a882c50ecb5d191317a53ca2a72b58cabd4c61908e20249
font_01_sfnt_off00010085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10085 19396 bytes
SHA-256: 40773a4faa1f00799387bbc5704ab3647c400d4d7bc9fe73f8bd1d30b66c4f87
font_02_sfnt_off000132ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1