Malicious PDF — malware analysis report

Static analysis result for SHA-256 f071b69171947997…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 04:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 0f0a231e7e1bbde4efd6d78b9d50701e SHA-1: 3713cc001d7c348c2425efb7f03d77c63a99071b SHA-256: f071b6917194799787c33806abae45672e7b83518e91598432a3e36084dbc50b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting it's designed to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=fourier+transform+of+heaviside+function PDF link annotation
    • https://hosvagyok.hu/userfiles/file/76825222370.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/sotageburagajorojemavob.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d774e3ac4b3---59859948520.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/e06q56c4ldloujfak4524hrn7d/kitetijorofiv.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/56737850174.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161031c9b75daa---pakuwetek.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/gipijabufavaz.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/7424654213.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/17306a97c2ed48d1cd93fcf4d8f65617/godelax.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/44815836240.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/87174115301.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/k8jau3266qilseqtc94l397laj/dobalenuzokebapasunubower.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/duwotaxerarem.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161296155e7078---51243566246.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/83294189610f5e7574a5d.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/zorademonamupofupazaw.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608846ef3242b---72639923605.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/77210552948.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/pudimemaz.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/gojadixipotudo.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/tebinubupivosepivurodog.pdfIn PDF document text
    • http://freewest.at/pusika.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/zizowelaxevixumaxowobusav.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_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 20708 bytes
SHA-256: 3e1f26cf070e91712b652a5c3efd40ab76564da966a6ba2ad9f6aa8799faf94d
font_01_sfnt_off00011221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11221 10840 bytes
SHA-256: c13377b8a2b66f2cad3d42d036113ce682c1fdfb0ffaf62f07e62f898b832582
font_02_sfnt_off00012b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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