Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c82ecaf143a14e0…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 12:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 579306f0f2867cb7ae3a8dc4ebc54223 SHA-1: 4c7cad1816ac053f2d46d5ae033fd954e6a31b8f SHA-256: 7c82ecaf143a14e084194c042a69dc0f72242d8a652fb0417adb5bebdcad6cbc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The document body is heavily obfuscated, but the presence of external URIs and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=how+to+increase+ram+in+android+tv PDF link annotation
    • http://sungwoneng.com/upfile_editor/2021/files/gesuzukakaguge.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906222919.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/8812299112.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350b9ab41d9---40732936899.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/tobomubelufex.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/80970608833.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/69381188919.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/52392468410.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/27313356220.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/tewuxipenesenabewa.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/makavexek.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/tigavopovikigepekadak.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/fabus.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/62923829664.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/84907374938.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/74771035891.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/43476605906.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/29154130050.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/ravudirog.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c595c62411---nefefadogolefuwesenog.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/tce9r5h9jp88t2vc4nsvrmd5kd/29902779059.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/51214590400.pdfIn PDF document text
    • https://grancom.by/upload/docs/86832395778.pdfIn PDF document text
    • http://datcat.vn/2018/file/49035068398.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613251658e574---peruselivitipenonewo.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_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 10628 bytes
SHA-256: 8487e8b87d5829f3fe2981b7c34d8d193912c942c81a8209a7ce492cc7200e10
font_01_sfnt_off0000fa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 17564 bytes
SHA-256: acc181b6b3507fef2037a1dc1eba4957f7c044135873286a8670519e04016051
font_02_sfnt_off000127a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1