Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34c310b430c3a72…

MALICIOUS

PDF

84.9 KB Created: 2021-07-03 18:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a5b17681e329a4ba304d54dec5a1642b SHA-1: 5636f59b7e6521d493580224fb6a96f41224c64c SHA-256: a34c310b430c3a722c5c5f223f1bc9b7ee6cea941631032582dc8b611416b778
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=inflammation+in+heart+muscle PDF link annotation
    • http://terralis.eu/catalogue_dynamique/file/75263419627.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/65489411880.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/35381c12f7ac12d44118766d065cfb9e/74901604727.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849debc029e---lerobofepetevajowijipevoj.pdfIn PDF document text
    • http://azizolace.cz/images/file/47229418891.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/197583bc01c30b84e122f7545227ee12/riwizori.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fa6ed6b502e78d262975d1db18e6311/2354821731.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/612d7f9d22bd8e92fd9c60685aca4757/41552232034.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/337518f8a6ac81b108eb7a03f2d7a1a5/bagerovaneka.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210612015826.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc46044bf3c---rixosubuxibivus.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609a44e24869e---52343323380.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/sosebinutirur.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b03629c5c95---52664702154.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/dujopolomikam.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/wapafeg.pdfIn PDF document text
    • http://capital96.com/userfiles/file/18736820500.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021050808282364199.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/zilab.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dc46163b7---22349394276.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/xixaginufura.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b4177d5c0698a60a252167f6eba95040/pidikotove.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876ee8a3db0---lugitibobazu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc408dee4d7---lejupopidutizuligifom.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/jumuronebulidarewovozogaw.pdfIn PDF document text
    • 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_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 10652 bytes
SHA-256: 349a87dd0b6d8ec3ef9f5cf77860c01c3923d0c957de4cee78fb5697af20ca2e
font_01_sfnt_off00010258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 16808 bytes
SHA-256: 8fd9a242b45a6af767f4e88cbc944d100460b4167355c88af3b5697cbefd243f
font_02_sfnt_off00012e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1