Malicious PDF — malware analysis report

Static analysis result for SHA-256 370926a4bbf38a2a…

MALICIOUS

PDF

84.6 KB Created: 2021-06-26 19:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 115d90bcb21f9bf05eb74bad376c6e56 SHA-1: 5fe263c6ae930a155c65b09f2f95f3fa40140ec8 SHA-256: 370926a4bbf38a2a31013dab1661c0d2bd83dfa38bc8f584caa7c9a7fea02e45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous URLs, many hosted on compromised WordPress sites, under the guise of a free planner template. The presence of UTM parameters in some URLs suggests a phishing or spam campaign aimed at driving traffic to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/1b3fd33f16d8bccea2b693be5295b830/49522292347.pdf In PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082943a9f599---jelibiwijapejuze.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/37484335413.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/86218526950.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/gikamipalimixisi.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/zufizumute.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/52qngkvepak8o5esiq3nr9i90f/mofoxe.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/f5icg0u7pogdf7l68tltujadq3/marijizutiwafaz.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893e3f111a7---8411055103.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/j7qhik86oqnr416p2np9emvv03/kiwurozugetu.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/12999544639.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/jjoq6qqed2rvr7phfh1cvfobd4/61603793318.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608072c54d4d0---tamowumoninel.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc779627084---1598888792.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/48225312297.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501054749182607.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/68566970726.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608852b402b97---naxutesoxefam.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/189b220a5abbf3e111af525627ec3a6e/31297086780.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8590c0b83---zopibanaxaxajimoni.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/retode.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ae983dba4---meviwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+monthly+planner+template+2020PDF 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_off0000eb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 10592 bytes
SHA-256: 80ccfa96307e610fdca032d915d119a6d22521e1326fbe97b2a94c95d37e9128
font_02_sfnt_off00011b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6C 16184 bytes
SHA-256: 68770e9e24bc130da67dbefa211fc4af4012218f4ad1ffd25c7bbee844d2b701

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