Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be3430d59d617b5…

MALICIOUS

PDF

97.0 KB Created: 2021-09-08 04:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: defdc58fe5ac70389a209acb2fe0c635 SHA-1: 33215560937ad9f33ebb4789de5f53abe4e27659 SHA-256: 6be3430d59d617b535bb3d0e58f1c27fc66af037ed8187a8c01a216a84b4e49f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9421

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://tauroconsulting.pl/userfiles/file/72626657277.pdf In PDF document text
    • http://shiokuda1.com/contents/files/10828474331.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/80528553684.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/ziduwemejatabimuz.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78033858717.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/82279645048.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1610ecae78f47d---xizajuvagejiwavamuw.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/namebigetela.pdfIn PDF document text
    • https://menu2uplus.com/images/file/95638977545.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087572d446b6---wokemugukifigewoxufezeze.pdfIn PDF document text
    • https://norservis.info/files/files/welatonixaguxazetu.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/pemuwokoloparugo.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210717183234_etr0p6.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ca240db22---89932146180.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5cb5be686d30974c8c1495ff67cd43cd/77557319986.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e7bc11ffa---1459999998.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161170f6fafd4e---96064686556.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc523c9e85---sogifabogoni.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/85f35156d8bb0504a2beae5b28a717b6/93672115189.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/balijapiwetowupujopejolaw.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b068672f562---wekofelikud.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/diwikekut.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202108152203281237.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/76557312100.pdfIn PDF document text
    • http://rts-3.ru/upload/files/kunidonizififibufew.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/bevutoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hp+compaq+elite+8300+convertible+microtower+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 22980 bytes
SHA-256: ecd4993a09127a506e9edf0aadd1a3623051dfdb0aa0d5a16f5f3844c4171854
font_01_sfnt_off00012462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C73 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_03_sfnt_off00015203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15203 11400 bytes
SHA-256: 9b9618a3898cee454fe723c3571436dbabe0ad8146ddaec07443446c0b763b68
font_04_sfnt_off00016ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CA9 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729

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