Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61974136f1ca34f…

MALICIOUS

PDF

86.4 KB Created: 2021-09-09 17:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75f3f1a12a3a43f73cc598c6ea3a03cb SHA-1: fa5407d38c8be4a6ae106132080925411c496cf1 SHA-256: e61974136f1ca34f5dc0b3534e5a3417c004fae2c443559990f25a49420187ea
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised domains or disposable hosting. The document body, though heavily obfuscated, contains references to QR codes and embedded URLs, suggesting a phishing or malware distribution lure. No scripts were extracted, but the PDF structure itself facilitates the redirection to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://reparationmobile.net/userfiles/file/23683422019.pdf In PDF document text
    • https://aristi-trap.com/upload/users/files/sumazurug.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/77492497950.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/36976852758.pdfIn PDF document text
    • https://pellevah.com/upload/files/gezuzivutubulexuzaniru.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/91731523416.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/xagolexa.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/e422369dd584d8b822ec97132111e13e/lurixikorudogudul.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/59947394389.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/61837360741.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/velugolizodexurul.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/67594427967.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3d7c71453935d5fc1ab946f28b617867/murov.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/foxatobesepofupimadaj.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109032002337090.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/79712787350.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lodajudu.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/jerevijusojoxakinidoval.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7502a5e5---61542799568.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/46708532089.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/xoxepij.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/95282254287.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/xaxijavejujavelojemilexu.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135a8ec38819---11953538076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=halodoc+pharmacies+apkPDF 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_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 17828 bytes
SHA-256: 84b1e971bf1fda64f8edbf84906402bbffc24eae30e58eecca75ccbcca809295
font_01_sfnt_off00011bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB5 10660 bytes
SHA-256: 24ee4bd7f256161a743bb106d29e8defef60efb9fb162e12eaf9b6f6a9e51a2a
font_02_sfnt_off0001340b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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