Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d943a1d7d95cf7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-22 17:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c4b6448fefd0cdd0267b30148509b8d SHA-1: 0e7289322a50f2fd795a11468e313900fa46282a SHA-256: 90d943a1d7d95cf70fe0679c9f2e5827b65cad4dc4877fcdb2fee2dd6e57458a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to facilitate initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://oniceh.ru/uplcv?utm_term=aircrack+for+android PDF link annotation
    • http://songpinhao.com/userfiles/files/kajuxewizilibukakomitog.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/30101753108.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/21555254786.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/43244605714.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/43591833857.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/pilekodosasab.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/17212117999.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/78298993901.pdfIn PDF document text
    • http://strandedtattoo.net/file/31529932052.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/gariri.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161318dea9ed74---24758223424.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/6173038552.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/15541057708.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/40987516318.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/31691218031.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/nikaruzedenixo.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/35915268334.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/pavolidasukejas.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee781937b1---38462014620.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/42b3a1884f8044fc004c17b3108766a0/fonidibilakidelepe.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140bdcfdf96e---jopiwuledanuxabolufovej.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/lazodad.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/zibanolidi.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/fivitebusuxenige.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed8aa15b52---nesexuwumutuxubunexagi.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/28214276524.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_off0000ccac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAC 10100 bytes
SHA-256: dbd65219ee4439bc2b9979aef7593da0499e66558579338a25ef4d5ebc916b44
font_01_sfnt_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 20968 bytes
SHA-256: 82f63d24c31667668f48df98cf999c64342c9d53f62bc763517c7e250de18d9a
font_02_sfnt_off00011a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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