Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d6c2e8a99e0522…

MALICIOUS

PDF

177.1 KB Created: 2021-08-01 15:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cde69ce0dcb33923820d764fa7f1d5f9 SHA-1: 3b281f49cc5bae32c7b53dcb0b9cbe949e8ecdb3 SHA-256: a1d6c2e8a99e0522134c4eca0e3d272b67a5104023124afa7786e69510ff985a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute phishing content or further malware. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://archism.ru/uplcv?utm_term=sociology+100+final+exam+questions+pdf PDF link annotation
    • https://ahha.az/userfiles/file/68660246915.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/88149790398.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/de4aee56867b0259f647f3ec3b6e6bd4/69949673501.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/92259275344.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e38bf27b93---zufak.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/7551935102.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/606243ebf846c544e6cd70991a1029ca/80258006166.pdfIn PDF document text
    • http://arlington65.org/clients/880802/File/jikizabusodetosape.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7d704772f3c5e072ef8ef595eb71d3ee/30347999402.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa7d9191d---mulikogozigifuriraziw.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/jibetidasebo.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210726_9342A4738924B8B6.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/xulimafirubaz.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/kubusamubokaxininipubi.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/c1fabb2d451ef9460f0e0eef244eb806/15786966788.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cb14d299d---pewemafewune.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/fowurujuru.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/fadus.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/94d05740cfa2ebb89bb0d0b57004ea37/dudumunaniwuvuremiwuf.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/wopijikadupalejujifele.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/74965918705.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/tijaga.pdfIn PDF document text
    • http://erex.hu/upload/file/63857685490.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5e230e379804f3336d539643232d0270/18063983760.pdfIn PDF document text
    • http://cl-pub.com/files/files/26950673857.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_off000253e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x253E1 17096 bytes
SHA-256: fd9dc0f2f080261a5175d44b5596be865f6d7404267f71d4a666ad022a24cade
font_01_sfnt_off0002809e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2809E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000298b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x298B5 11572 bytes
SHA-256: d439617fd8419c8d00029c0ea1722e45465664c9abe457f1ab0fb837438cce16

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