Malicious PDF — malware analysis report

Static analysis result for SHA-256 121cf7e37d17b509…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 16:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 81646902806b6a3621bebee37ccb2e0c SHA-1: c624487df218f05a3c8da9dd87904d56d88c8e2a SHA-256: 121cf7e37d17b509bcf8a19bc92a235098c0f9b0612158e30251121735588216
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous links pointing to compromised websites, including WordPress upload storage, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms on disposable hosting indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=introducing+yourself+worksheet+for+preschool PDF link annotation
    • http://studioarchperissinotto.eu/userfiles/files/74084442845.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609da996332c7---bexep.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/kukopekogijelufeja.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b30cab9f5cb---jegovobugusesunipamekugol.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/99098864646.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/viwitozubapat.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/nonavinivedukaxixigeb.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/23458428939.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/08/file/20210708_061737_183.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a17431e95a89f2f2ad0be3d780b2aaf6/potepilaludu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa708b63a3---16612723706.pdfIn PDF document text
    • https://fivetc.net/uploads/files/pezigotiloxo.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/zuvupepaj.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4451c6b51---rixijamuzudoj.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/juluvimipobomipi.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/28215852917.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f2e3126a7---favonubin.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/18a5d3d3ebc7502f59b101873f26790c/rojobeloz.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d48b254f8850f56286147f2ffbc0c9a0/faporabi.pdfIn PDF document text
    • http://artediapharma.com/upload/files/86099038887.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/sodofomilolavubiw.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/b0vmi6ar78irb2bjaimadam0ep/kitovore.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/vuwigudomurivige.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 18796 bytes
SHA-256: 342cde464ce3159d60bdb8bb08968cd22187ae0dd089bf7ca287db52d394b3b9
font_01_sfnt_off00011230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11230 11080 bytes
SHA-256: a4c7b3d0e49dd8878cbf40aa073ce82e922e6c453d9466a13816fa2f9a2e5bfb
font_02_sfnt_off00012bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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