Malicious PDF — malware analysis report

Static analysis result for SHA-256 560aa50e8d23bc74…

MALICIOUS

PDF

91.0 KB Created: 2021-08-21 11:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eafb7582b8346cc5e8941792101e3716 SHA-1: 55331ba92a7d3205b056b83ad7b23657df3bb9c7 SHA-256: 560aa50e8d23bc7487369506573815e4e37b8cb40d4c42c6e34a5c54e70fab9d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS platforms. This suggests a phishing or redirection scheme designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://www.odnpoznan.pl/fotki/file/file/madesuzalisikupilononaro.pdf In PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/55ed28125f34e70e4957fd4730a76016/50705715815.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/dc88776425cf72239581d047462a83bb/vepevimidujobex.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/tarebemirogewo.pdfIn PDF document text
    • http://hajni.pl/userfiles/file/71084923488.pdfIn PDF document text
    • http://wearefamily1234.com/clients/3/31/31b46d3307e4516335aa88350909469c/File/zarewogenijaritax.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/52587259183.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/24102057025.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/kefunusovof.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/vudevaxuti.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/95554757916.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/55738054250.pdfIn PDF document text
    • https://jobtiara.com/files/files/febukowizupefijasofajod.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/sojuxijivukewep.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/gegugivesifusif.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/zunafilepewavununetenuj.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/645gfedn4d649i6poi00tg7e8r/33570073973.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609780e307e52---80972924961.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/406c4d2043da4beb97ea7abc437ea604/97487627798.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/zosoxuxidalebezimakurew.pdfIn PDF document text
    • https://unosms.us/userfiles/file/67210179313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+use+roundup+tree+stump+killerPDF 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_off0000fe85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE85 17936 bytes
SHA-256: 07a8230a397bf1095761ef90a1cac37518686062679e81f8633d7eea93dc34da
font_01_sfnt_off00012d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A6 10660 bytes
SHA-256: 718804bbb66236be0eadc90970e6e598f82d0348eac7ecad88c5d9ad1f275be6