Malicious PDF — malware analysis report

Static analysis result for SHA-256 206b706186807e70…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 08:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4430c6678a065ff9e2114a22df35f435 SHA-1: fee4c9ef66d8cbaebec29971746b4a7c1e521078 SHA-256: 206b706186807e701fd948c394aaca11a2e16d4e97d11caaaa8438074c273b8e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to numerous external URLs, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links and compromised hosting suggests an attempt to leverage various attack vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://medvor.ru/uplcv?utm_term=how+to+make+fluffy+slime+without+shaving+cream+and+contact+solution PDF link annotation
    • http://www.first-classlogistics.com/image/upload/File/ditugu.pdfIn PDF document text
    • https://aksusu.com/upload/files/bijosasogalutitokajigag.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1p9dqldaemqb7k5vrgou117eq1/43930652682.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/miwujezakugaf.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/rezelazegibivimolabubel.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/edscumer0n0djls8obnj8g5o44/kedipozujawelonitixukibot.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162281802180649482841.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ek8t13sgnc0enigsfcnbdni58n/7982112884.pdfIn PDF document text
    • http://asustainable.com/global/file/lisadawufaluxiboduw.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/legasujototerapunitivigo.pdfIn PDF document text
    • https://aspirans.com/files/file/dadazaji.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/wuzofifosibubugevesaso.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/siluvefi.pdfIn PDF document text
    • http://cosmik-kino.ru/sadm_files/vokunareka.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/or5a12an9vvgu5j4hof1f3i770/tufoguxomagibigowi.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe7b5b863---siriwonerojudufoxabasola.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706683d38e0---49595494907.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5bfeba08ee5ef804c9157f92ad3725d6/babimezelogij.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64ef527bbc---64983503140.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/buzupenozilunos.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6nu8ntm83e9lis57ngcivo3nr6/jovemuleluwikasuj.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/25129852321.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/14263601868.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/zupuduziweve.pdfIn PDF document text
    • https://dineflon.com//files/92405907733.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/nekugavuzosefataneze.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_off0000dd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1C 17588 bytes
SHA-256: e6a8fc0b7bf66c19ab39115c038562fb6b381ad090a143c0c7422f731c1e2178
font_01_sfnt_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 11372 bytes
SHA-256: a3571f32cd9b3837a02ad0df3bdd28c8b79c7b70fa592f615fd5600681464aa3
font_02_sfnt_off0001247f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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