Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a6cd4b3bac7f83…

MALICIOUS

PDF

75.8 KB Created: 2021-06-28 13:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 817113b6cd81b123ba3d11956a27c45a SHA-1: 808fd6ba53e206b1b42b51332e77c5d6f85a663d SHA-256: a6a6cd4b3bac7f83856b35ff10e00d2c0d17ff947dea6fa91a6ccf4d21dad9a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous PDF files hosted on various websites, some of which are identified as compromised CMS uploads. The presence of these links suggests an attempt to direct users to download further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/fedf1b47c67ea285b2bda03df8f67bf9/38528610696.pdf In PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/73501816712.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/mli53u8dslk4b470lghtn93eq2/fepipadekevodekoxejafut.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5fb6a209---sejagajogodaxera.pdfIn PDF document text
    • https://lymfologi.se/anvandarbilder/221/files/80700936001.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ce70452aff12d43e366093938a09e525/10201443875.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160917a6c22d6f---31964640722.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/10082076799.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/45275189467.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bac84d75765---vifubi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a880d436460---moxatozede.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/beb0722d17ca2fc9e931767f7548f0d3/80773364610.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/b7769abe32fbe3287164867dd1f0719f/42561135339.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/b5dfdcae0c6578d4aed35ee277b12897/9221688318.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078a44c44efe---bazajofewarejekujoxezokex.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/tapotumu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fd5890748---25655640326.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855e68dd287---57892240505.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/70959836536.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/bdgrv5ssgg3qmfk4mgjfetcilq/13183138077.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/cad664a52a9fb5d82c90f2dabf5d3f32/ruwotunowi.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3ddb43a71f51a8413573771b90451a4b/18880391885.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/73709646869.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30778c0655---dadovuz.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/11494145629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=i+am+wrong+mp3+downloadPDF 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_off0000c27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27E 18640 bytes
SHA-256: 13176185309a75cde6eaa4a8b381211bdd5b1c17871e116bb34e127761a47687
font_01_sfnt_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 10456 bytes
SHA-256: ddb4ad8d7c16db22bb1b3f427639cad08b3af8226d61ef9ce834ea1ffc97bec7
font_02_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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