Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d167fe89f9e1a6b…

MALICIOUS

PDF

101.2 KB Created: 2021-09-07 04:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8864b8bc2c81be9ffd17915b8ed66887 SHA-1: 34b946c921db69222839d84e1bf6e5dc6b53a61c SHA-256: 0d167fe89f9e1a6b45bd2b61e016496c6e34d81663b4726c0715d3862b9d6046
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with a link farm designed to redirect users to malicious content, potentially leveraging JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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
  • 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://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/5dd6f2eaa62cbfe80a528781f371c34f/53063691116.pdf In PDF document text
    • http://absigorta.come/file/1584017597.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d61b56c25---36172933041.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/bolimenivosasanigagujur.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/sosisam.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/foviw.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607456e84d3fe---23894959683.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/22123439557.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0333ef760046e5e90ad685d6658429b6/fiwagifilavusitigizika.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/vorewedijedoguv.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/81171052553.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac152f0b0bf---fowesatufudedevipag.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/263cd7a6ff206dd8bb6b1f5e45bfeeb1/wekupapukowa.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/21d8a4682695cdb7d79cf85ef78ffbd5/zemimogelizezerifowalef.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/cae6ac78ca335a6899740c53f2f8afe0/40934280421.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aafbdaea569---depetatulenaxefunotu.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/sekij.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/sofovo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/5c5f97e9b8cec64b9382c4868e5afb12/dagakurejalodozaxosizi.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/16041230708.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/63006754929.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/85184897169.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/71572044219.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/gowusezedanezat.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160781a4625ffb---86458297962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=2014+ashrae+handbook+refrigeration+pdfPDF link annotation
    • 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_off000124cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE4 11236 bytes
SHA-256: c2321bafaf875e5fbda1319f4cd9a3655c317a29305b259bb2890a65f8e446ac
font_02_sfnt_off000156d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D8 18504 bytes
SHA-256: f9e88eb297dbcf7fa8a878a56b7783600360a87046cc94fe8077e671655f98fe