Malicious PDF — malware analysis report

Static analysis result for SHA-256 220f7c024265860d…

MALICIOUS

PDF

77.8 KB Created: 2021-09-02 03:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d46aff45f8432ddb5dca2242ac9255e5 SHA-1: 5fb10491fdae4c8250a1d400fe967a6de406b6fa SHA-256: 220f7c024265860ded0c003fa120826f739c178f77cca967011fea499d33b977
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various PDF files hosted on different domains, many of which appear to be compromised or disposable. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of link farming. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to manipulate search engine results or host malicious content, aligning with T1566.001 (Spearphishing Attachment) as a potential initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://suriyedostlukdernegi.org/image/files/taxedofowimekafamig.pdf In PDF document text
    • http://www.niziointerior.pl/upload/file/lokoxevepidubijowikexonu.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/menuvuderudijipe.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/eem6816iu3o3u2doggiv6di8q0/bogikebukadixek.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/aca4af437dcafd5c20fca7e120634d01/18893982719.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/gemotepenakutenabafu.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/38057945146.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c88aeb25bf---jikoladuz.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210902050353_1658564135.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/kabewotefolimo.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/64916681146.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/29847198582.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/e53hm14ob12gsjv9nrdljjiek3/nejipeju.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d35331812f6---38433831837.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210730024348672.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/vamoj.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/marufugisimotoxagujexulof.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/89407558824.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/16966450130.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/9123821334.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/miqtca90ggk021gjm5tptkjh51/gedofaxivevulip.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/igmd15l07vu73s4nh1tl200j76/30855007405.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/a202crdhk3bul8if1mjo2isuc4/26796396613.pdfIn PDF document text
    • http://aozbt.com/clients/3/33/335f642cf73e2ad82edc7dd4a76dad4e/File/87115001972.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/61820606983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=finding+the+nth+term+worksheet+with+answersPDF 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_off0000c928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC928 10804 bytes
SHA-256: 6449d3f5a317895c331d9282822efbeb65558ff804740c94e1ca5e122ad49208
font_01_sfnt_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 18112 bytes
SHA-256: 4e8c3b5fa4666a1480af372eb9f6d605a3d49f6b91e1055dd8638c302d6f9a90
font_02_sfnt_off0001102d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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