Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a58d264f61c836…

MALICIOUS

PDF

81.2 KB Created: 2021-06-29 02:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 82ecf1df898195f7e0ff19f02d7fb8e3 SHA-1: a199ec468fe418e4a31be25f47148a36137ad716 SHA-256: b2a58d264f61c8369a3f5b341da2f5b4c953a54586afa90777f1cbede060f532
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous compromised websites, likely for phishing or malware distribution. The presence of external URIs and links to compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729370613d1---41561934671.pdf In PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/288smibjdiqmv1bgvl516mpu7b/67417892262.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbcdb993c1c8acced69fec29c4c69275/17692146089.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d6649d10d8abf68ca30bf24796d7c046/86683061707.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb03d26132---11010291856.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/58925720587.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/panawepavusivef.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/jezusataluxexedadu.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/a4af6a6821bac5f060e9f6793a0e1e17/mupirameguxufafonokomalib.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/72c8895c1575ac7244b9f518f7ceee0c/ridupozafiforajotozuli.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/loragusepo.pdfIn PDF document text
    • http://phunhai.net/upload/files/giputubebefisaze.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/vakizurajuradagonixe.pdfIn PDF document text
    • https://langumeistras.lt/i/File/sukikasogazoxedegumuf.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa51d43fa8d---wokifubafu.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/fobedof.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/dqbuu35inapi3imjh553mo94g1/libosi.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/mumuvezax.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/sevekovi.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/tusapunitosuwemobori.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc066c08f0---3048700936.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870b90a4f67---vesobuwoverag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=worm+inside+the+stomachPDF 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_off0000dc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3C 10580 bytes
SHA-256: ce9a26b055e98f6a0dfe3c42c77071eac4467793888686ea76ffbcf63b5ac004
font_01_sfnt_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 16732 bytes
SHA-256: 92057fdc874dfe536204aa6bb0495d58f4284468771a148b903b432cff67a98c
font_02_sfnt_off00011ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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