Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ff07d35226ab5c…

MALICIOUS

PDF

74.4 KB Created: 2021-09-03 04:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51c1d9ad5dff17962d33746624ffa159 SHA-1: a977a0b35d2691ca7f0e43d4920a4113fc1a7fae SHA-256: 10ff07d35226ab5cf6c5107c5fa287075b5357f7610f647945d349419a88cf07
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. This structure is indicative of a phishing or malware distribution campaign, aiming to lure users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160867ea8ac1b9---98470198510.pdf In PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/9kuqplglj9ab199a3vium2pv9o/losinigomunufirabev.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/78659849609.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/92141122878.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/lf1ubn6is808unrk877s9trkg1/67302808154.pdfIn PDF document text
    • http://faradbox.pl/files/file/raxudetu.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/15441615974.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/83010047610.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9lu2mlbf8iljm5qbguf2pv3kh9/53090416760.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/92166968845.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/96630683808.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/jelojonerug.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/nuzoragivutijunufebege.pdfIn PDF document text
    • https://signika.pl/Upload/file/28271317792.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/e61eftkvqumm5gsb5q86fvlns0/25998772418.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a592d6baea4---numogaxeloru.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/barodopoveroleworerarawit.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5bbd75c7a---43710933126.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/bidujenakut.pdfIn PDF document text
    • http://jarosi.hu/files/file/kikav.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/83746389248.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/dupolifepa.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16124068dd7f09---42408552379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=predictive+maintenance+book+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_off0000c1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 10868 bytes
SHA-256: b438964826c593139861a59204d13c1463963e303e3060e586e968254e6df13a
font_02_sfnt_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 16076 bytes
SHA-256: 124ae9de95cb0bf6f47b326783459e27c5422281e20f75352e86b2fca5285e20