Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0ba3a64c6f4018…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 08:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d782d14c51adc01bc9b5dd8236444d8 SHA-1: 206bb27a83ea973096684438ae27349a45a91e93 SHA-256: aa0ba3a64c6f4018244d26d5328340a2819d3a3f08e17805cbecb51d873e0bfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many links pointing to compromised CMS upload storage and disposable hosting. This suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7972

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://nerezove-kuchyne.cz/UserFiles/File/86895978195.pdf In PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/3792232969.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/bigodavo.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/vosafofutasikirido.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/fezunitomarekigojiw.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/fujosazipalafiwun.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/69884751926.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/wivedaluredejibumis.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/93328507297.pdfIn PDF document text
    • https://angkalaris.com/contents/files/24696471558.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/patazol.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3d44709f4---xazeno.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210916104749.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135a1331518a---mekowesejisulajubebi.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea2b0a244---50764820789.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/66314245145.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161345a3782dfb---30742248275.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/bajubajebibi.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8ac644daa---zajozexudubogizitizox.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/rodebifotujinojol.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/savuvadoma.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/38415823059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=apps+with+malwarePDF link annotation
    • 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_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 17532 bytes
SHA-256: fc4df0aa864016f29779bfe8774ff6b4e5e18dd5e175b17cd7dd70e3231a8c21
font_01_sfnt_off00011084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11084 10360 bytes
SHA-256: 4be0dd8159d8007ac237adca0fe92ff4207f4aa54aed3a8136ea96a8d854ad6c
font_02_sfnt_off00012806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1