Malicious PDF — malware analysis report

Static analysis result for SHA-256 0854358ae45d796f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 20:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f78571cb1913bf1369710ce09ee254c9 SHA-1: 0e62a1121cdedbee2f016d13e53667ded24e2b37 SHA-256: 0854358ae45d796fc12ad160cf8ee46454615e9ced3c47601613880affb812d2
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 as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b00d842424---mobobovep.pdf In PDF document text
    • https://artbynela.com/uploads/file/93393848839.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16107eafcce9ec---79865771564.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7c8bb46db1b2eb272b5a1b0a90b4a896/44168558704.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/28298559565.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e441cc2a4---39792948756.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/93916284097.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c55063479---wusesivunigogivonudafe.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/14244645968.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/12a470d84c4e62c7d415b26743dc67ec/xupemozekimikuv.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/i6sjj3k648lt4t8smf13qkfud2/21781988575.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/gewubesivilevewenatetuno.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/53094803068.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b01887aacfa---dowazu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/163aae3457fc8c7f5abc31e2f56c025b/45307274813.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95352e999e60086a7d9e8e1aeff0d461/20614245283.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/nuponaxomudazob.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4508f3b819---xosasizukubik.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/75020744217.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e203a5beb80529566f404bf84499e75f/88418554776.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab78ce014bc---nopedemexupexi.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b38fbfe83---pusevenotirotamamal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=2019+nissan+versa+s+manualPDF 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_off0000df8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8B 10584 bytes
SHA-256: f6d8382fb13375c3bb8302b27fe005c91fece73cf0c0aea847db99301b2ee370
font_01_sfnt_off0000f7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 18164 bytes
SHA-256: ca8aa151168d0075224c8ed251b8e081429fc527f1a595071288021e288fbe78

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