Malicious PDF — malware analysis report

Static analysis result for SHA-256 67989be434d40142…

MALICIOUS

PDF

105.2 KB Created: 2021-10-24 00:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1dd22f9f5a3e1b868d377d7b10ef1a59 SHA-1: 20b55f7aeaabddba01677c6f26b3f04427827180 SHA-256: 67989be434d40142686a85737b5725951bc79ac6dd67223f1d46b5113c6cecf3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm or phishing lure. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://philabc.ru/uplcv?utm_term=maggam+work+blouse+designs+simple+images PDF link annotation
    • http://kxxbs.com/uploadfiles/file/a/xukezejemadenunogakun.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/peliwexudemaxu.pdfIn PDF document text
    • https://cedd.saglik-network.org/uploads/file/pogebodoxadodori.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/78649550067.pdfIn PDF document text
    • http://mongolia-volkslift.com/uploads/files/40722189012.pdfIn PDF document text
    • https://fitvital.hu/userfiles/files/nofegerig.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1617257a376c4c---wapibezax.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/pilezixuweneboda.pdfIn PDF document text
    • http://dejonghenico.be/sites/default/files/file/wadajepedetitasowu.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/65968713799.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/72754097023.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/lelidemotefazigefit.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/89528752909.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/417317019616d26a24e864.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616e2a785ca80---29965942897.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/fedete.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/8f1c240433c2b56b179b351a98aa8319/jifinoresudibijijaf.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/25557658998.pdfIn PDF document text
    • https://dm288.rs/slicice/file/29454607479.pdfIn PDF document text
    • https://mkart.it/uploads/file/juniveberujodiv.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/larodijupajabonav.pdfIn PDF document text
    • http://apvn.info/userfiles/file/49725691232.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210916061835542.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/15449483628.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/64223228963.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13807 17308 bytes
SHA-256: d06d7ed0e64068f6281ddb13f23d824ccc6a81c5c5b3fdeddeef2c91f4196930
font_01_sfnt_off0001648a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1648A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CA1 11048 bytes
SHA-256: bfe54c5734724a0b15565f017119ba6bf942bcc3e066691042401ce560fcd3dc

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