Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a81797bb20fa1e1…

MALICIOUS

PDF

98.8 KB Created: 2021-07-03 03:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2d060a39aedbb4aad3c1984d8d6ea359 SHA-1: 0a6fba8efabd70c7c77980869365abff69592704 SHA-256: 4a81797bb20fa1e1838e87ec5096c3dedcb1407e470529a4039c5fe0e36ddc07
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it's used to distribute phishing content or further malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9374

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=12345+i+love+you+mp3+free+download PDF link annotation
    • http://bilmatbasim.com/userfiles/file/68873492397.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/jumobitojifefetaj.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ffe0b694e---4837459890.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5mjv2g268a31ivblstnjhqbp74/40349659448.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/75915744447.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/91601195475.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/datukogepomilepol.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a2d26f36e0a254b715cb396e744d620f/50309632437.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/91078494372.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/wowesomifutajor.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/98555155655.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33fbdc8b44---91560332512.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b084b01407c---kulotitoleto.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608265e306807---bopegizodatanutixezas.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/lasaxofekatepilesafita.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/1987f934aec78e46c3662df1c37ecf67/80035148407.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/8natl1aa73b4sfqj2tkh85n2v1/wewudov.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785899aa734---razupo.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/tejerizutujinotovig.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/turelufedopezibubalu.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///semelop.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/fuzumokifazozukimuvudet.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-3/20210503075910901685.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3bs3s2dcd4pdip0qc6plt43se2/karosixerinuvowasewurut.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/mbf4blbdhdoltt68q5b077adsc/11339233013.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/6479799577.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 11220 bytes
SHA-256: 3e7bd3614789a7966063f9c469ad49e0feecb6b857aeeee8cb8658ad33c42fce
font_02_sfnt_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 23684 bytes
SHA-256: 0675afe3d7cd795d20aaf1b01a27db00f1a35fd02f94b4f848f8b0e8b9d47086
font_03_sfnt_off000135f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F4 20496 bytes
SHA-256: 7f7c2a49ef11f6007d4a541aa13cb34ebf7c132e6b5285bdc567de4d3b795cde
font_04_sfnt_off00016596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16596 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467

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