Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a37ccbeeab6409…

MALICIOUS

PDF

86.9 KB Created: 2021-09-06 02:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 615ef7b1a6365b9a80f0b4c142eb543a SHA-1: 435f181966d1d2b8c0230418515b23a46af3374e SHA-256: 29a37ccbeeab640982d995732c15b78079c88be2a80d2bb2014263a8253db2c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised websites or disposable domains. These links likely serve as lures for phishing attacks or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://crysiq.ru/uplcv?utm_term=presonus+studiolive+rm+16+ai+manual PDF link annotation
    • http://madmojo.com/fckupload/file/fuzikakapuli.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/bidowatigitavekupiloxumi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/18236875641.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/79575077359.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8af944843---pemoparik.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948f2031e27---45190304041.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/78832684074.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/77dc67e90964d3d4ae1905ac6a07e30c/vataxugagi.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/fibezaletep.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/42324056738.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/28136086354.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/bc8e455071bc92f315b833c594fe648f/27419507488.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/nipidotewovobob.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0f527413efba34a97caf19bec288b65/71203283856.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/65340976075.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5371b41169---sutasokobaperiro.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb27a5a7c1---nixovi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079669ec431c---65471167992.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/bm509d3hveepqlrkd33b7nb0s1/bovirexizujulepepi.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/96176630814.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/puputokufiban.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/14900841413.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/lik4jsl40bvsgni8mk6lu2i2c8/39034204737.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/wefirulinebuvibonafatimel.pdfIn PDF document text
    • http://castel.lu/userfiles/files/kizivevew.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/fc0948c0f582007afea0da8a4450ae19/senejufudojokoxokuri.pdfIn PDF document text
    • 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_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 21120 bytes
SHA-256: deb1bd90c7d8a5e77183a2c1d227de3d732acc7153229ba5ec592af6c84820b7
font_01_sfnt_off00011a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7F 10796 bytes
SHA-256: 442f6ee21fa93553a253ccfea0c590f28e95e9906fe10f9df55185086ee2820e
font_02_sfnt_off00013375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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