Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db48af68867e4e0…

MALICIOUS

PDF

87.1 KB Created: 2021-06-29 00:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66436f6f6dd9695f374f9fd71f324889 SHA-1: c4fd0d8aa0b81bc84a7a4f1427e47e31b595ec8d SHA-256: 1db48af68867e4e0fb5dce9c073f44c49a62d6ecc13aa49280d6397c9c52919a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bhk-aindling.com/userfiles/files/65847748684.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e12398b295---gazag.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c772d10fd3---wufuketoteva.pdf
    • http://dui-antidote.com/images/userfiles/file/18584572950.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0bdc67a0e---52475157022.pdf
    • http://tulsamemorialclassof71.com/clients/84987/File/77197687121.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160763020ee509---gudotabosugibosuravon.pdf
    • http://ciccioinpentola.com/userfiles/files/16542102496.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1882f6efab---kegepubesowilupuv.pdf
    • http://sbox-technology.com/upload/datoteke/zamejekuj.pdf
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/vovowozale.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf8bd7fc9---kopok.pdf
    • http://pritchardreunion.com/clients/81409/File/79683199286.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160976c9835fc2---80931314426.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd30269f09---92613350715.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/a66d14bcc5efaf7c68ad3cacd017bedb/61963067454.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607372e5cee46---mebevoxape.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608321744addc---wugelebovefiduzeli.pdf
    • https://menu2uplus.com/images/file/mibemipexut.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7dbf5201a---65236724388.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5aa44ce253---zojoxamoxakepenox.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/3b642c081b433df94cc4d9139ae050d8/vulobesimes.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/3qmpc7oj0hsmo38vcojva7a42q/30834816634.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=rhotacism+speech+therapy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efda.bin
1b342ef59eb85804a0c45a12730c15774362967db7fdffd1ad518d35221cca9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 10648 bytes
font_01_sfnt_off00010857.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 16792 bytes
font_02_sfnt_off00012069.bin
da6448b1393ddffe5d91ebb0c6c7220947f5c68025dae5eae8d612b4def4f242
pdf-font-stream PDF embedded font (sfnt) at offset 0x12069 17824 bytes