Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dafd8b83325b94e…

MALICIOUS

PDF

90.2 KB Created: 2021-09-08 08:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6371b2a3f23a9aaf2ebcccdca0f50267 SHA-1: 1c66bb0a498270ec609de5957d93b69c7a4da07f SHA-256: 7dafd8b83325b94e91285e1600b360c13b0c9433132c48705202b9b24296a882
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the overall heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/687d0ca4db8c87abe982bd63296c16d4/96340928148.pdf In PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160969bd6cba0b---17339717307.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/52582040305.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/mujoravajulitusef.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/csvkk2grligqluctu66hq2e132/6966169394.pdfIn PDF document text
    • http://industrialdevices.in/uploads/21037758617.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff96b55688---fatuvowazatovexikuxupogo.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/83164848624.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/22247300600.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/e0pdqqpjass4t1d1uuk5iesav4/jinasivujunibegujitu.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/lugikexidijiji.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/f7connp9931377h640fa251ooq/83064244295.pdfIn PDF document text
    • https://ijpdua.com/contents//files/29621891491.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/30134728743.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kosa5v3lf9goaqn48lk8pgf6g4/31190359277.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160fd565dd6aaa---lapiruzufubawufevevubup.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210904141836425.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/pd6jqvpbvrn26kobbkmeeeicc1/vavitunuvowuwonuwi.pdfIn PDF document text
    • https://immobiliaresancarlotrieste.it/file/pidifepivorijeke.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109f5003c84c---41335184700.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ndkfo3rfo4u0seifndhheg2s6h/52028394896.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16082af8a0109c---91102821694.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/96236850083.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/rasajuzalenumilupaki.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/javupejepifawileliseraduw.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210715204129783759hffrr.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=definition+of+alternative+dispute+resolution+pdfPDF 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_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 17368 bytes
SHA-256: 6fbd5e0154e6fdd95606c0fb4082992d69956f19138e725328d8293d6a9ec123
font_02_sfnt_off0001421a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421A 10656 bytes
SHA-256: cac4dfeb08b97bc71d6e4060b24d5411f6efeff8c07a592b8d932312830e3524