Malicious PDF — malware analysis report

Static analysis result for SHA-256 350cd8cc60225e4c…

MALICIOUS

PDF

97.6 KB Created: 2021-08-18 23:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2adcad96d1f7363c9b83bc5923832833 SHA-1: 7f754e001edc60a75c3ed438a27f37b35a7bbeca SHA-256: 350cd8cc60225e4cbb83f10bf6cb060f839392bcf70cd2b7bf413e4336b030a6
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to manipulate search engine results or redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly indicates a malicious intent to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://npi-management.org/ressource/site-image/files/figulixewitovo.pdf In PDF document text
    • http://kfbi.ru/content/file/fosopelulipi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe4f2f67349---murebef.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/30921291138.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/56458725411.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/80b75354218df2a248e3553fd614e570/13538629543.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d67d2b09fd---jamoduzudotip.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/67464623568.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5dd0607a9---minute.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/60197988647.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608b04efef4be---telusixolonabizotup.pdfIn PDF document text
    • https://windsbs.biz/files/file/22908335267.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/48347631566.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/bfff5c4f386a4453af1d29701cc4a85b/fabiforape.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/92903905977.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607959e49e32e---rabavatedis.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e911254582---dixebezawijawubul.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097fd01ce452---72348774599.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/38484131356.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/79727642742.pdfIn PDF document text
    • http://chieucoingason.vn/files/93596174848.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/ruxobularabugakumi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b6fba0e92---20336608639.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b754d1584a7---jegipagexejazo.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d5a47a5b1---90287640786.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/jewivabejaf.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4d35de4a7a417efdeb4b1ffc3c9063a2/93293630159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+study+for+nclex+pn+in+2+weeksPDF 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_off0001172a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172A 17680 bytes
SHA-256: bb1dd3f187416b33854cb5a7a2fc56353118a9fb45c287fcc80dd178a01f6880
font_01_sfnt_off000145bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BC 11056 bytes
SHA-256: c881865630fe818d593ccb24b94b9428c577ecd3a07fca6e03b2210cff2ce1b1
font_02_sfnt_off00015fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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