Malicious PDF — malware analysis report

Static analysis result for SHA-256 758aa0334ad13b94…

MALICIOUS

PDF

86.6 KB Created: 2021-09-12 10:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 834392e37fd4b2b5c89a917ee792a6b6 SHA-1: aa74bd935f6fd9d2af90b8a25dd00ca8f812c791 SHA-256: 758aa0334ad13b945908cfd9137f8fc7ab90491a52c532e2f4b76e8552598382
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=similarities+between+greek+and+roman+mythology PDF link annotation
    • http://saothienemb.com/uploads/images/files/24786071098.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/79970937405.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/23009050299.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/50296522973.pdfIn PDF document text
    • http://elpijisystem.com/file/duzodi.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613230670a54e---tomazituvesemulu.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/22401780891.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/vuvamemij.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/79514038936.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/3218365576.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/rudatorurutuwunenax.pdfIn PDF document text
    • http://jawarakreasi.com/file/derataberoxugowerimit.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/58419049496.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/67681052495.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/wogedageko.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/55364351281.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/naxovexosuperodigibuvofa.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/73284521275.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/57718832047.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab8e542e87---74519434439.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/52408655718.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d9d608bbf---nuxunebogiwogabanofofav.pdfIn PDF document text
    • http://jiab.net/userData/board/file/125746416.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/nozabajabevowovufitot.pdfIn PDF document text
    • http://netart.hu/userfiles/file/nevaneworonuvimuzawefur.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_off0000eb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 18340 bytes
SHA-256: 611f076e10a4a4016dcdfdb88cc6e0619dbea2c88014aaa40f3b221ec706d53c
font_02_sfnt_off00013227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13227 11204 bytes
SHA-256: bd135d9d81fc5e27bdb94f04893ce3f0a386943ea22730a78f58b3457c761f6d

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