Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27875d718eeea22…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 20:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3e1a2b382f3333566986d25c11e5e1b SHA-1: b4ffa63b801d10fad24344a661d0b4fcf117a4b3 SHA-256: f27875d718eeea226ce87566e1bd3bea07eb27b0ae339a3600226e8351436d4e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload. The presence of a 'call hacker download apk' UTM parameter further supports a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://n2nnetworks.com/files/others/jolonaligipasemawose.pdf In PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/rogukumo.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/87366920276.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/tokumibuwunafewo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614256ce9fc09---dofeveropawuze.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/bofalufulolosunawamidago.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/zawusewumisejofapejafak.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/rokekumemonevorasusipu.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/46095899773.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/kapuxitigig.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/borizuwosifi.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b961a46e26---56307021187.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/fkvvq7h7o2n184rlqdf2t42d8b/davapizurimagusajonoxoxis.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/15663334305.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/21253199871.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/95095173606.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/fiworobewu.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210902071624_732721.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c07d41e16---55052247873.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/xawojuzurafabujikukap.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a2001330---62438070475.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/ronomaxakirel.pdfIn PDF document text
    • http://skia22.ru/pic/file/roxepixejizal.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/5586285653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=call+hacker+download+apkPDF 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_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 10460 bytes
SHA-256: 0515e8a48773146718617be138eaf91f5048c5bca2aadc9955dd93932fc0cc1d
font_02_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 18376 bytes
SHA-256: 440f5c00f5e1d11bdb810829b4006ab1b2e126d185bc32ad331131ea3efe0b00

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