Malicious PDF — malware analysis report

Static analysis result for SHA-256 15281d19b1225833…

MALICIOUS

PDF

87.4 KB Created: 2021-06-29 19:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3310c24510a67ff5672d53b567a0bd8a SHA-1: 3c48c313edc1dac7f846c95b8b0cf60ca8d815dc SHA-256: 15281d19b12258333765f6f7189516801e5ad67430154b75d7f6f695d2c120aa
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS upload storage and disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://magyaringatlanadatbazis.hu/dev/_user/file/sofinudibez.pdf In PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160756b78eddb6---40699331404.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3de7ad052a---xadekenemifozuvofoberego.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b79fab95e01---lidopuzimojodu.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/32047836647.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/46f3cb2d15009f9bf3b83976302f1032/74638725390.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/jigexewodiviw.pdfIn PDF document text
    • http://absigorta.com/E/file/44911301207.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/nawowakajasatibokuzoxo.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021060420082980554.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f91e5ddfe1---revezujinidusuxozetelof.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/20262493291.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd332006deb---98730876117.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/kifajebekubalapa.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c44939a42ab7014438b1d7fadbd78c69/nirazeginiwanugevalobe.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/3774055256.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b997accc5d8---33287077645.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/76da23c73f0a67192cb19cd586779148/rosel.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210629133105_sku6n1.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c94d4187890271d9ed266d37d4ed69cf/99322434021.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077e719a25a2---lavezigatunar.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc679439fd7---nidimazatafikugatewesav.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/35452223c3b4850cc54d1de516f92b66/35384774201.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073929c6b9b4---79213955986.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/55807173954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sewer+department+near+mePDF link annotation
    • 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_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 10288 bytes
SHA-256: 622ec0decfc709ff2ea03c98ae86c5cdfe3a42abfd76718317591a38af7a5341
font_01_sfnt_off00011383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11383 16796 bytes
SHA-256: d13bf4e69959af71ce2e6bf7d58d6df23a625478c369bd67a3b54b9909e3aa2f
font_02_sfnt_off00013f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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