Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b58c5c7de88cbda…

MALICIOUS

PDF

72.4 KB Created: 2021-10-01 03:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9614027626bbc24a17ecce380bbdc165 SHA-1: 97d11dd770f47bab1b1862e320e129b91f5089d7 SHA-256: 7b58c5c7de88cbda54a31ea5cd27bb02e42577e2b753d7eeac1af1d5c42e64e6
164 Risk Score

Malware Insights

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

This PDF sample was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to various URLs, some hosted on compromised CMS uploads, suggesting an attempt to redirect users to phishing or malware-hosting sites. The primary purpose appears to be luring users through deceptive document titles to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=grammar+friends+1+teacher%27s+book+pdf PDF link annotation
    • https://hospvetcentral.pt/site/upload/file/68576006058.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/18917490961.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee77b31f6f---82836535750.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/lanojawetunetulofamonako.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/zadin.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210918032730.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/jizoxabovuxijiwadukoder.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/wadojakerosalesurum.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1595f536---zumuvamil.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/95793928845.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/43199045709.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/3fb8370303779153ee9d4467bc149742/bofusaluwipijusa.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/ratasujabo.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/xosuw.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/vajiwume.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/83506873173.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/57646524292.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/60271521563.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/4360246643.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/44486863965.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/xisap.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/rulinevovimifuzepela.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16142c6ea94e51---82194830596.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/woxoju.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_off0000b3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B1 11196 bytes
SHA-256: b6fd9ecafd78ec5bfba52fb1dd902d9b66cfcea58d902ba84e2879127d73c1e0
font_01_sfnt_off0000cd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 17700 bytes
SHA-256: 866282ffff3d1a617adb6a1cbb0e76e813e928d7d35e52b0df2d9d48b47471cc

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