Malicious PDF — malware analysis report

Static analysis result for SHA-256 6191cf46a3b90d3e…

MALICIOUS

PDF

100.9 KB Created: 2021-07-03 01:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 90b2229f8b9a3715d4460823779d9560 SHA-1: e7250234c1fdb39c41d0120b22e8bc6e7ec632cd SHA-256: 6191cf46a3b90d3e95198d6f1664d1452214898945609d54208e3517c926674c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable due to obfuscation or corruption.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://deltarealestate-eg.com/userfiles/file/mutagisufasaraf.pdf In PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/th97mn1p1oi5de9dbmjmsivo5j/tafadaxuzopirivul.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/6fc6c2c209011330442845637ded39f6/95841532306.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5f343e5be---62073390076.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/1f2d0134f23f6bd72fe2cb2804c290d2/wuzeworubebatu.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/simesapuwupetofadanun.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/5qt5u3emag6sgc2fkhol64ps88/xebagabewufovutineg.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/fusezinisan.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/vejefexidekiwifidel.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/wewiwip.pdfIn PDF document text
    • https://papiratisk.cz/soubory/34513020290.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/eabb83e87ad372c76586abe9e9c645c0/13369843576.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/70407196266.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160812384ce6f4---fugukefoneletesavufejevi.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6fe60c99cf48a466b033a20f31a6d94c/76735830966.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/74729d299922949f2b172f1bf79dd2f1/buvabiveruvogukevuro.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160915951b8198---61348184470.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/2ff9f0681b2d2cb8906336bdfcc68352/33441020191.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0n51bf96fialu9evijs6gp5j11/66464693876.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/kakew.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/14315674150.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4ea2aea8141d69f67020325a64c01eff/vijub.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/2679caa3307a798b1eec47691cb0cf5e/68317720218.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b4608b274---naxuwagaj.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/pazufususo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=red+dead+redemption+2+missable+trophiesPDF 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_off00012296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAD 10964 bytes
SHA-256: 76dd48275b13c8e367cf72b1d23cd2f40a41d5fe96c780c981c219466e21be04
font_02_sfnt_off000153af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153AF 19372 bytes
SHA-256: b165d0c74b3de95cef2f586cb5ef6ac821e42fbd1804c25a6edb41825ad0a1d5