Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d0ad1696a6e07c…

MALICIOUS

PDF

80.0 KB Created: 2021-06-28 23:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7dd6c451f418acb613ba1f25476862c0 SHA-1: c45672649a9d6697613d71c5d6bdccaa7964d871 SHA-256: 67d0ad1696a6e07ce8681e8d25cc9f7e45fcd6308af59910a9f2eaef789156aa
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites. These sites host PDF files, suggesting a phishing or malware distribution campaign. The presence of multiple distinct hosts and the use of disposable hosting indicate an attempt to obscure the true origin of the malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3290

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://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/8b4f7ef2314d6e9f429e922e55be74b0/8318204680.pdf In PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/642kop021l89skav4tsnp1v4co/wusiroterisom.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/70795598080.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/saxiwizonimufujopajowisu.pdfIn PDF document text
    • http://airsoft1.ro/files/file/88396348691.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a9abb3f5d17169b9e82af3df7ae54b3d/56058876340.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc587432175---nopaxib.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/rixixewukunes.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ca495e8aa---80193940103.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/nakipidebokuli.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e41dfe0753e49f114b091f68c92402fe/guzatipabaf.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6e22d716---wiweb.pdfIn PDF document text
    • http://leguido.net/files/xubowemojekozuvozetosad.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/bmf5aen1e96a74n313g6uagj3m/51915123274.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/6ad4221caa390954beb51cb5664bb238/pisajesuremapil.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/7486144b031470b9fd8023d0b0111245/ziwumaxisuxoxusi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e86751d29229e3f21853081e18ca4be3/99867700498.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/d43s4a91jdo59rbo9gd1e18vqi/59817222140.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/15110767612.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609870c454fa8---nazepudazujimiwiwopeti.pdfIn PDF document text
    • http://askort.pl/Upload/file/xekerokivaguz.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/lekeroluberixunuresuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=example+of+transparent+lightPDF 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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 17648 bytes
SHA-256: e44f3f46432608cb982c2d67a74c9533ea04fc36885b12df278930667edeed4c
font_02_sfnt_off00012554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12554 10892 bytes
SHA-256: 2469cec9c1957b127d235540aed0079375c8a7cee03073c9bf3a93c6a2c72fec