Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a98c758d46ecdb1…

MALICIOUS

PDF

86.7 KB Created: 2021-09-19 17:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f76bbb6447b405717c1a348792237922 SHA-1: 14289541e5f414439e8980abd96351fa92bdfedf SHA-256: 6a98c758d46ecdb18adf8dec5e7401575177b33331e3133cb3f2977db35b874c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://gz-chengeng.com/uploadfile/files/besonugilenugapovizo.pdf In PDF document text
    • http://pinxedien.net/upload/files/77676627841.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090914275526.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/gixoguvetifutum.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/polikujase.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/mitazomomekoj.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/77002288391.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/sasolopode.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/woravuwatirarekazubalefid.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f899f9063d---90468524087.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/falegemofusixamuwu.pdfIn PDF document text
    • http://irinabailey.com/upload/files/98106402762.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/fuzozokekanewoduvunuforej.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/dobalirofinozi.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/98311939801.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/pavuxaveda.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/8220242127.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/xatazuxazodaposunonajazek.pdfIn PDF document text
    • https://phnews.ro/files/file/zesumiterinasif.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/5pbld5cb5v31htejlo2mb36lfd/lesulumafaxuwivujewa.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/97673456806.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/31188021618.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142b25211d56---mebejaxorisasuwexogapuko.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/vonavezijexivejelubo.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/xazagubu.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/batowop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mens+short+hairstyles+for+oval+facePDF 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_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 10604 bytes
SHA-256: 9f0fd44f0386f1c33e1cfebe9f315d1e0b885f8d20960b1bee1aaf01e9fafdba
font_02_sfnt_off000120e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E5 16956 bytes
SHA-256: 2d492c604e5b322e2ba7ba48964e1039c672de5009fd86173d4d1d381cf8f997

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