Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a16a05b02a38d3…

MALICIOUS

PDF

78.7 KB Created: 2021-09-06 15:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e41a27fb377f784f065950542576c1aa SHA-1: ffdfb5a1c288175dbc74329a6851aa5839462d52 SHA-256: b2a16a05b02a38d3ac6c9e24ea85c1d28b914d894274e36d5ee34ca3ea525dd9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a phishing or link-farming scheme designed to lure users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://crewmak.ru/uplcv?utm_term=adding+image+to+pdf+python PDF link annotation
    • http://ajivikafinance.com/userfiles/file/bovakade.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/guxuwevujewebazegugobiso.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/daxubiza.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161132d2706346---35039173308.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16121cd2f59f7f---98496606537.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/rifumokulawawi.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/k0t3fb5jme4p2dfuqki3ca5vtc/zibolazirogubijigure.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/38764818427.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09fd2bd516---93699460024.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d386a647d22801944cb6eee5da46d366/98511744952.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/38245424322.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/kuludatinijabisezezopid.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fba4b936c93f51289b33a8cbda29bfdc/26157675231.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/434e0caddb4388a4ed4a2bac1d6732a7/84505757604.pdfIn PDF document text
    • http://otczenacts.com/media/files/20359615859.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/nt98epk2v4pesn6d6sfnqnsk71/fujixijidinume.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/vemobibasaroxabo.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/dimudewugaxunuw.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/47927789045.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ed2d8b0c71161a71938ea58041f1c783/rosovotukalizilibik.pdfIn PDF document text
    • http://jump360.co/upload/files/20210824000227.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9a5f335293d4cdfd307b6e2175005e07/58376938734.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/pebewoviradesedet.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_off0000cdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 18436 bytes
SHA-256: 164a66f1d77e44f4f693b666aeb539708122edd40a6c87e42b0aaefffe218699
font_02_sfnt_off0001157a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157A 10728 bytes
SHA-256: 96309908e11f79febaa39864a21b80977276f067819dfc8cc664602edc27fa0c

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