Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af41cc389432f43…

MALICIOUS

PDF

88.2 KB Created: 2021-07-29 19:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a97621c1f2d934b44e65c85c5b5a534 SHA-1: 9f5160732691816e1e218cd9dc4d3a5e96b013af SHA-256: 9af41cc389432f43dffea3444070a9500cfacbce998006349c319cdc8044f3d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to lure users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5191

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 https://euroroma-bg.org/files/file/55946737558.pdf In PDF document text
    • https://12tiga.com/contents//files/89567716324.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2oljs3v7m645263r4bjkv76pps/90360593845.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/kolilojasi.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d08645c93---siminavugososabalurawiti.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e406b3b2bae---12322461427.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4613fee011---29813179313.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/fd8b9hlmd68vfrvmf93h5s8m40/feleliwegorulaxiruju.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/91761557050.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/fukoxidina.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210609230005141.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/menofaketexuneki.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/84704151868.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/kodujujusewelebavan.pdfIn PDF document text
    • http://erex.hu/upload/file/gumebebe.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/7b5792929bf9ff6e14cdecbd7edfa853/60256560094.pdfIn PDF document text
    • http://strandedtattoo.net/file/wikamifabumuvukebofo.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/297a13edc0f7f5533c76eebca5cfa59b/12547087130.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/12610735756.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/20987653718.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/lutoxesolida.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hcb080tt0ge869g69bel3oggnc/22567874930.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e94b37b01e6---25778581952.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c30e2444b48---55904377732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=asvab+study+guide+2020+freePDF 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_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 17440 bytes
SHA-256: 7b6c0d8b967aee94f05a14b429e8c426bfe0b24503a2e807a60c2c8dae77c357
font_01_sfnt_off00012f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1F 10904 bytes
SHA-256: 19b1485423ccf820bf716bd3335ced86bf9a56f23b573a8c6e0fa45b4fd187be
font_02_sfnt_off00014869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1