Malicious PDF — malware analysis report

Static analysis result for SHA-256 a845327223fa1cc4…

MALICIOUS

PDF

71.6 KB Created: 2021-10-03 17:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1f3234a50f853aaf4951821c7b5c97b6 SHA-1: d562e8b73e5217f6ff1a8567db335e4fdc875268 SHA-256: a845327223fa1cc4adff1cedffebcff470b45160d68328853ac7fc3aa2c90454
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting it's used to distribute further malicious content or lead users to phishing sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/20ab46d35e229c67bdde329854248110/50150854570.pdf In PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f913d7e5fc51698efd3ab7d534f15a18/48958102303.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/vabipa.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/bowuzarudo.pdfIn PDF document text
    • http://www.bash.cl/media/file/82336342165.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/xenotenodagikanigowewef.pdfIn PDF document text
    • https://oalysa.cz/ckfinder/userfiles/files/56583515328.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/ruguxumovajexurodesibozo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/of2hdh3fhinfhp94ofrjn42cv0/dimevumisejilodaleb.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161502fae86bd7---76571298525.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/19875463276.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f92a33145a---54125023572.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/mizefoxedinadipuninarux.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/1t5esotm0duliqq9ut0k0chj3c/fupexiwogavutaxenesa.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/32890178464.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/41438186446.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/82554507018.pdfIn PDF document text
    • http://canadianrockies.info/files/file/gizejaworegepimekepaz.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/pagoxin.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5572d3d33---kidoxatidoxalesux.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/gonelevikedowusupezep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+save+a+pdf+pagePDF 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_off0000b324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB324 18192 bytes
SHA-256: e641eb091054a39e2dc9e8b725ade8b7f01a375dd0dc0203d1de88cf77bef5fc
font_01_sfnt_off0000e144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95B 10476 bytes
SHA-256: 63bc9daf3377fcbc4c17f61ece088de574322164c947e82409c8c8ade32cd9f0

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