Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc48f373fa801285…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 16:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb486e37587a74fb8d1843ef50cc5e7a SHA-1: 59ced9c0d221c8d92aaa28b43ef802b869d0fa10 SHA-256: bc48f373fa80128507d2b19d3b398af8930d6f15ab406df2d539a1ec4c90f79a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7068

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://topoint.cc/userfiles/fckFile/20210831074250.pdf In PDF document text
    • https://bonacorsi.it/file/86410470911.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/fubale.pdfIn PDF document text
    • http://northcity.rs/slike/files/75330189957.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/35364409861.pdfIn PDF document text
    • https://parkettworld.com/upload/files/lifenuluzubituvewetitorix.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/vopigoza.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///379573084.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9290ed4a57---fodubevujisatirov.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/24705343534.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/vhb8duqma1froet9arpqnc3g4d/94399782368.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/wupujipinanemi.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/bozidadurexilugukusi.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/39347332093.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/jimamelagoxar.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d01e164f---zabonevutakenibigevumovi.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/11748938810.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/99737500808.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/nowivofepugiwexa.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/dewiletudopufewapowe.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/2858785407.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/gopogusumeba.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/f0e720bcd9de66ee3b8f9cac2354ab3f/denudep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=anatomie+et+physiologie+du+coeur+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/7915b0e4cf96a622136694c0eca74a7b/39841602054.pdfIn 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_off0000db7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 18060 bytes
SHA-256: c06748bde72e74bcd0b5846ec39e4c65f725d8cb720d52aafba5e432e36c9021
font_01_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 11260 bytes
SHA-256: 9c85232b7d53a5f398497055c95281ab734c559d4b65c501b803a834f7ab0cd5