Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf35a075787fe37…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 22:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cba37db690aab2738c74fe77909b69a9 SHA-1: 31ee4745991127e62e40810fa69a140abe2b3ddc SHA-256: 4cf35a075787fe37671c341674bd5d728d64c8ce6429558366e6760a667ef6af
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://trsoftyazilim.com/genelresimler/file/63114240062.pdf In PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/simik.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/60558223674.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/zasis.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/40774884501.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/xaxibe.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350074b490d---xubum.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/7402450384.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/jefubonodofazuwejalorowav.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/rakulenesotidagupaguduzi.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/92573602212.pdfIn PDF document text
    • https://network-italia.it/file/13780490784.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210910002125.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/13313752295.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/fesemevovafopiwusas.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/73545836135.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c42f69b8fe2f7fb2c9121f4979af6f66/wamijupikiwuzetepiratas.pdfIn PDF document text
    • https://o-dance.com/upload/files/13501751779.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/02096be25d29723ab907123cffbb5090/30691663003.pdfIn PDF document text
    • http://birdwatching.sk/media/file/vafubisixugufolujanoker.pdfIn PDF document text
    • http://change4best.ru/upload/file/varolekuvomuvodis.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/rositifadiroviwefem.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/vowomibogavixewug.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/filavixutanivim.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/10119924047.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/67615063624.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/fufivelusumawuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=suit+selfie+camera+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_off0000dd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 19160 bytes
SHA-256: 6b36c8df9f14e553be1d95ac4b4ed55b11449b3b239d9fdbaf993e1d3fb45138
font_02_sfnt_off0001279f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279F 10684 bytes
SHA-256: 0fb70c4342ae7ce50fd989dd31a69113536080201f6d2fd896bcffd3de9d7d02

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