Malicious PDF — malware analysis report

Static analysis result for SHA-256 1579e3fb5bb56ce4…

MALICIOUS

PDF

75.6 KB Created: 2021-08-17 00:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f9b0f7374ef94632d6e03a5697193280 SHA-1: e4c887c48f26772938c35ec0f34c210c7f2f9322 SHA-256: 1579e3fb5bb56ce4749948c9c237405c366c703ca648fab2c14571c0af169dcf
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content or further compromise. The presence of a link farm on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://dakmoto.cz/obrazky/file/74034357153.pdf In PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f96b24d3d---zazimevidadajulozedege.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/95290372540.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4fba2e83a---wegikibikugewezelalim.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/1338350546.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/6372126521.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f27598450d7---77083461384.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7679675da1---pedotoxuw.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/50659137262.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/99705464369.pdfIn PDF document text
    • https://ubitanduk.com/contents//files/kotixa.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b9a299fd---bufudepavozej.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/88440426542.pdfIn PDF document text
    • http://hanleyresources.com/images/sigimogawijonigavejez.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/gavezekibonomosizabelino.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/42447855490.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/xozosipusezokipofake.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/96045155684.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/15991369c9310a3958afc4a55cbf7108/voxomigobanetan.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cb2f5bfd1---soxusup.pdfIn PDF document text
    • https://soechi.id/userfiles/file/vefaxapafazogepowak.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/600da89731378f3f359b3d91c8e479ce/vuzofizowomojosolekede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=domino%27s+pizza+phone+number+closest+to+mePDF 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_off0000c422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 10976 bytes
SHA-256: b2adede1043486f1d02cb25af332d4b08757609199ae7eacd1361ede845074f0
font_02_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 16712 bytes
SHA-256: 7228f6ead8f4cdd01f05f13a4aa8ed75dc039c7afbdb0614228a7091316119ad

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