Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98c647dad9fc99d…

MALICIOUS

PDF

69.5 KB Created: 2021-09-24 14:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: be2551156444085b16492151b64dc66f SHA-1: 14f05b62b4651513456d2f13ffa3f6ece77bdce8 SHA-256: d98c647dad9fc99d0a7cc91d2c5d1b1e955e0ccb070c9769721fecacc922e606
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external URLs, which are characteristic of phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://atavio.ru/files/file/kogibizukilesewaxej.pdf In PDF document text
    • http://zaintik.org/files/galeria/files/vibediwi.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614d243fafca5---silisidena.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/15074884942.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/bd866b720690ed52196a17e79e44615b/16660343897.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/54289423399.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/veravakuno.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/82234805923.pdfIn PDF document text
    • http://fteq.ru/files/file/xobupabetozasimaziv.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/jamafejuzefovoxujenituzux.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/girusobenobu.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/bilegekotimike.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/fovujafurazilotijim.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/64059528473.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1632126139677360079.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/rowokaxego.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/nesoduze.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/89221274729.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/34577552046.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/jedetuniko.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/munokomo.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/45180063796.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613188c97c478---1434515071.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/ruwunafozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=yts+central+intelligencePDF 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_off0000b1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EC 10268 bytes
SHA-256: 0ad6b0dd9c9c959cd4aa12d0cbf9ad352d6477d881e3c4705f51fb648de6e91f
font_02_sfnt_off0000e120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 14796 bytes
SHA-256: 9dbf4b500b4df3006e56b857999fc287f063181a52fe7ff7beef1d6a2b496911

Open this report in the interactive analyzer, or submit your own file for analysis.