Malicious PDF — malware analysis report

Static analysis result for SHA-256 417bf1153426bcd2…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 21:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ead8d31fa02222661fe6a49cddfee383 SHA-1: f40e47645a2820f5b4dc04edc214d63a46bf6014 SHA-256: 417bf1153426bcd2362a29c105897681a99d834c3ea8a93180e90ad08955419e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://philabc.ru/uplcv?utm_term=pdf+signature+not+printing PDF link annotation
    • http://barefoot.pl/userfiles/file/96420689193.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/sipidokusarofiw.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/53850515418.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/27428968528.pdfIn PDF document text
    • https://sinarwaja.com/account/files/vifojeniwopamukuguzitafer.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/xibizudibozurujofateri.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/nijugilimevotiraj.pdfIn PDF document text
    • http://neteyes.eu/editor_up/2395739305.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16135104481344---gimisixibovajugefatiz.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/68988001996.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/sinevitomexovol.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/zawodot.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d50d008e---38344319889.pdfIn PDF document text
    • http://midel.me/userfiles/file/7183602196.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/zoxigefojezumipojib.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/4533487836.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/kusizawu.pdfIn PDF document text
    • http://tiquital.com/documentos/file/29785957724.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/tivubowalewizabewapuma.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/nebunevalopifixakajaw.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7652aa2d---88234662493.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/90618248657.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/sipubev.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/gogetabopafosutopob.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141389650a02---bigajipevufefilizavemomos.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/55699656931.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_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 10728 bytes
SHA-256: 4b44986188f76019cefe96aedb99424af7b74ceaa31f94c18d7b59cceea0e1a8
font_01_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 17104 bytes
SHA-256: 6dcd696ca4a1accbe270ee49d2d36e29cbfff8f3569fdc49ebdf04a12a5c1375
font_02_sfnt_off00011df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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