Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df5bbdabe75e8cc…

MALICIOUS

PDF

96.5 KB Created: 2021-06-27 11:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 532be8f1e483ebd486b96f0957ef3b7d SHA-1: acfd770d6637ff26bed98a8e4ed77a048bfa9777 SHA-256: 3df5bbdabe75e8cce3b86175f2a303bfd87728655578e037754d0ac15e174bf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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 http://primaneighbors.com/userimages/labixibixug.pdf In PDF document text
    • http://almar-bus.pl/userfiles/file/76749782018.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/90963211715.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfeb5a83c1---ludedowotubuwaditemarefat.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094d37da3f5d---rovurubifogegum.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56e18709d2---rarerowusimiwuxodejot.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/25efbaa7c31ecf9814ba32511e9e3b0a/68087093340.pdfIn PDF document text
    • https://kham.vn/userfiles/file/bovurigunaliwotileb.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf00a5d376---jawanolam.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/d3c26354d886cc43fa9cae7abacf3931/38443297137.pdfIn PDF document text
    • http://northcity.rs/slike/files/dipuvo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6fa405c30dce381ea1a4796b3f36de5b/2151019042.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608138492e4a8---68165203705.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/4rt42mm5ichs8q0nlqdc85gisa/25802842926.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e6656d8f---91305396647.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/a75eafe71c3c309e804adf87ac0e9c9c/lixenobopoporolepujedimu.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/2555401383.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/59729923991.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/19cbe6048413fa483f70e421069ffafa/22235835810.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/80615857970.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786d2816b4d---jovabamofuxogerub.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2301fcc9040f9e1df294d8fec8ae5408/21560398142.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/8ddaa1c0374a7690dad3490e56c9b177/xegowo.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/gabepabizijimojasuz.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6f98040c3f9615f59c6fcabf8af5f92d/tetuvalipon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bbq+lobster+tail+with+garlic+butterPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001165a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165A 17552 bytes
SHA-256: ffc0467e8485908127e3bdf0cf7815a66504ce0c832c3af9aec2d6c2047ec598
font_02_sfnt_off000144b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B3 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off00015abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ABF 10932 bytes
SHA-256: dc48ab9b1fa6268c752aef523e00127aa01ec542fc6905794482e318f7a89c38

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