Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff123b9feb991a0…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 03:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86a6193496b0c1eb8378c6b110b1602b SHA-1: 96904b977ab6a5a33498f64fa5d25544c00810d0 SHA-256: 9ff123b9feb991a00230fb5e5a7e57c23d22b635929b3f2d34bd9168f868199e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised websites or domains commonly used for link farming. The structure suggests an attempt to manipulate search engine results or direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://desushibar.com/userfiles/file/wesubovadukukis.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160869ef019aff---8333650861.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105270813.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098609b35016---46982850694.pdfIn PDF document text
    • http://gsoutreach.net/clients/e/ea/ea4f28bd0b090870cbed8536b6d1d406/File/91750950339.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/10076032201.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/92948938979.pdfIn PDF document text
    • http://cloverdiamond.com/file/jetinuso.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/9247799676.pdfIn PDF document text
    • https://jin-ji.com/upload/files/vexigekoret.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/pinemipegezewaw.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/rotonuzatevapuxotilo.pdfIn PDF document text
    • https://kimansion.com/uploads/file/saziloli.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/10378869988.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/us0qpjnt7orunukdt2n24p4kh3/vererijetewo.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ef9b53f0be6259cd1d1700863a00ad75/wufugima.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/mifokosad.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e7eaaa84304---40475797905.pdfIn PDF document text
    • http://temple.mo/userfiles/file/gedulumu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/14573775816.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/nemitizurafatuvixon.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/bedinaleluzosizexeruzi.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/sunepawiboke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=encapsulation+in+python+pdfPDF 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_off0000bde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE5 15872 bytes
SHA-256: f74b683569e277482219ab2ffbebfaf458a9579e3dbe720d2fa6e2268789cbf3
font_01_sfnt_off0000e63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63D 10680 bytes
SHA-256: 227e8de8d1673ac1d46575535a3da384ef58822adc1f8afb4a9cb1293e295369
font_02_sfnt_off0000feaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1