Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4b962021e5877b…

MALICIOUS

PDF

72.1 KB Created: 2021-09-13 10:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db4eb1b7368359eb2ce50f573b2dd82d SHA-1: 246e18858f6c868ce04087ad656acfba49dc9ff8 SHA-256: 7a4b962021e5877b92e52408f6fa11d36c8ce78481fd0f336574d7b06b51487a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted from this sample, but the URL structure and heuristic firings are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=pes+21+mobile+mod+apk PDF link annotation
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/biwaga.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/nexaregadexosedosab.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/36093758473.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/bipalanafulibenanufojulo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ef142d46---23232241863.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/lovufaselategu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161343633352ef---pidamuwopuvovulel.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/rifenevatafakikin.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/somujusixodozefowiwi.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/jiwatexakokakuv.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/dinetoletiboluwo.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/49112326427.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/94c91a43820e1425b85fa83ed4cd9ed8/wudenesil.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/zizuxibuzateb.pdfIn PDF document text
    • http://llux.vn/uploads/files/1786208238.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/70332187045.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/korafijuwij.pdfIn PDF document text
    • http://beijingteye.com/upload/files/jidogibuwizamebejirezijo.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/67974012726.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/devijexotebavawojif.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/55174630146.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/lonazirurijugoraxup.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210910_C019F7CCDD9334B8.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/fumarisedisatuzaw.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_off0000b9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C9 15728 bytes
SHA-256: f283a4c548ee7843e5841c8f8b8c4136f0889502f206d29e6110699c8b95b823
font_01_sfnt_off0000e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 10656 bytes
SHA-256: 369f022641a93e884bc39222d6c59879d5fc74c91947d7bb667f1e6dcf41be38
font_02_sfnt_off0000fa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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