Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af100757c486dcf…

MALICIOUS

PDF

87.9 KB Created: 2021-07-25 14:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 356341ed1c2680edaaa925aef9772b2f SHA-1: d37a1bc854311b863c69de8ba4553d113c3781b0 SHA-256: 1af100757c486dcfb5d375b0ce4dce78716e95b89f05be98fd4f05bb27268344
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d34bc03680---buxew.pdf In PDF document text
    • http://pappteam.hu/userfiles/file/93643064737.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/adn5noqp7h9k7bekk845f93shs/legutikizexozekib.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/sijezerutazaxerokejatanet.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc6bc7052---sunidadawe.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/fajewixeruvorudasagovibib.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/47836217813.pdfIn PDF document text
    • https://basisnomor.com/contents//files/67217057774.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/24a8b2ef11d5ddf9ee97630e18bdadc4/lizizatidu.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/80686304775.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ed43f18053f9c78fb8262de037f8aacd/rivefafilefuweridulig.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce021d57885---pemipigogemazumogukupet.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/515e5a5a16155643128db6d18bf5199d/lusagojudebevezepufef.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/kosin.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/fekazojivetigax.pdfIn PDF document text
    • http://chikatere.com/Upload/files/xadowitofefimiraxuwuges.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2c02b1e5910da4392a008783be513d72/16792094123.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/65900332780.pdfIn PDF document text
    • http://le383.com/uploads/files/luziponagawowimowor.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/38921326724.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/12732467471.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/66362129269.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/xetuzutuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=naming+binary+ionic+compounds+worksheet+answersPDF 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_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 11424 bytes
SHA-256: 1948cc346158dadb4b8705e0d143f51b2cf7f5e8ef1a39ada0daebc1179e92e8
font_01_sfnt_off00010afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 17312 bytes
SHA-256: 09bd1b4f556b8ecef6d37ef2d83c19877ff7a1827694007feb07166d3c62a7cf