Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26f7df424534142…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 19:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 69f187639b71e9af0ce0f14df3c217c2 SHA-1: b50b695043adde4b8fe4c9d662e718f449f706f5 SHA-256: b26f7df4245341423f325e5cbd753342febac702ff42602a2e0efead2fe17339
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, many of which host further PDF files. This behaviour is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7f2aa3d403dea94aad52722ce92ca515/xikerubopaduk.pdf In PDF document text
    • http://anandtouristcorporation.com/uploads/bojalugufaduvex.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16071d6193c444---42175900952.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/wulowudaruzokabitazigisin.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/gijavunavexupo.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b1fa12e03---89778524257.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/2adce68322d882e2e46f6b32ce782fef/61141343963.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/fitobazafigefewiwidaviso.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/bhhv32lvtk1kh62eduup1ph3hg/90807556846.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/70832021160.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e773ee24a---74189668233.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/57tjr97tdtpol76ipvcl9fcmpl/88971678978.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4b598fbdd47068ffba2c82199d8dfb02/876988426.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/68255005411.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/nazeputusedasudonode.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/26770037387.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/figalegovudibajutazodipum.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/4484192547.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d474975c0e---virejilitejiwoniniloku.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/b9775d87684b1f584a11280ec1489580/81617906896.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/nesunalegabozunejuke.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/29425115951.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7235399c7---10660074929.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/buxawemekaralojabo.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/barewevaxozobip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bls+course+pdfPDF 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_off0000e786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE786 10308 bytes
SHA-256: f435c369b4bfc78567783735ccb5e8b1fb5e0fad7b6e1811d15d94da471b3db0
font_01_sfnt_off0000fee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE2 18152 bytes
SHA-256: e38e6b2acafe93a568f330479914d8a2551490a733be7ffd8c8cf5f94092d44c
font_02_sfnt_off00012d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1