Malicious PDF — malware analysis report

Static analysis result for SHA-256 45029a9bb277eb09…

MALICIOUS

PDF

70.6 KB Created: 2021-09-20 00:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c42ace695170a67b720913d01d2806bf SHA-1: b79da5a0b3f759072ee4124d2a0eacecd886d97b SHA-256: 45029a9bb277eb091626fde37ca7fc1a9aa5f8769da29b738ee2d57dc972f07e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to multiple external URLs, some of which are hosted on compromised CMS platforms, increasing the likelihood of a phishing or malware distribution attempt.

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://doanhnghiepvietnam.org/img_duhoc/files/soveturum.pdf In PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/gedonotutolaririnitu.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/dewesudigufemonijokanas.pdfIn PDF document text
    • http://grossbuch.com/upload/file/xadoxinulunizujot.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/wumuvotedet.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/tizoxapowapasipadapeter.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614553be6bd17---xaxesitik.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/dirupebu.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/topodifamuratovajid.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/xajuziregapi.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/75486332938.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144def3e01a6---vonekofabibibajeliba.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e4f1481e9cd93c5ec7c5bbe526edf06e/12768289389.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/16822180909.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/tareroxiz.pdfIn PDF document text
    • https://svltv.in/userfiles/files/41751611469.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614254cfbf592---jabumivifewe.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/95904441053.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210904041402.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/74196194130.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/45066363043.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/2eidvpcr4q8oa1putk7nol7gop/mojuwore.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b188d36dadf5b1031709d3729c274cfc/wuladajo.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/91468482868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=solutions+2nd+edition+upper+intermediate+student%27s+book+answersPDF 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_off0000b3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F1 15392 bytes
SHA-256: aa9ec5746563de5856d846589957386f8e93c476b6c3487523c11c2f88feb1e3
font_01_sfnt_off0000d9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 11200 bytes
SHA-256: 2e9b7c22c8cca03a684946803ae4db512a1af8fd605e244e035c4627e2902bac
font_02_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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