Malicious PDF — malware analysis report

Static analysis result for SHA-256 6645aa42b82f332e…

MALICIOUS

PDF

74.2 KB Created: 2021-07-18 00:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 88e0281f8c9a6cd0e58ebe4014347144 SHA-1: 1ea8c0ef9127075dc42cda02be8ee425f59c9a03 SHA-256: 6645aa42b82f332eafffe4dcbb005354ce47763e4bed5ec09b13bfa875a08105
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, indicating an attempt to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a link farm used for phishing or distributing malware. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure for a callback phishing or tech-support scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabbe88a877---nebirima.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d00c0866c---95656006162.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e952828db9---43873417898.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba695c0648---xosaditewinifuz.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/58748214377.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/81148068304.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/3978159471.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/9d3a370aeff8f5dc39886f704cddbafc/fonexadu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d3098c101---26969178780.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/52074019915.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/1fetkv9dtv7ka5ojo6jfe3duqr/vanenubemijid.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/5122246435.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744cfbcd36c---73665440336.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/541a1e6bac7a2352d0c172b531efd345/kenaduzudifixebuwopodexe.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/jfr7ifnk475akdt5234mlbevg6/gaviguvunawaduvozilodex.pdfIn PDF document text
    • http://meta-min.com/files/zuxopibedewemejevajetaw.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/42060152989.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e690b01117---83077192276.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/vigifukuluz.pdfIn PDF document text
    • http://balone.net/_upload/file///84793827366.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/3571857107.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e38509c7f7---gebajapawezaf.pdfIn PDF document text
    • http://tcihk.com/userfiles/dizupewo.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/pepebixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=security+command+center+manualPDF 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_off0000c0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DD 16284 bytes
SHA-256: 936ba6f95de2891ae7c5784e6d937262aa6558d66d8a9161c8a3cbec5edf2508
font_01_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 10652 bytes
SHA-256: dd185f8bbe2d06bdef8be54732e6978fd7050e65b478dffc51169c28e2a0ade9
font_02_sfnt_off00010367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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