Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f1a084337613d7…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 07:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6540c2c1db9f60b59ee599bdad45afdc SHA-1: a207a9fa9ec43f6f72c25c6f01cdf5ffbfce4c24 SHA-256: 84f1a084337613d794db8f5aaf82589c8eafcdb958a23103b0885fb468bdd72b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, with numerous embedded URLs. The document body was unreadable, but the overall structure and heuristic firings suggest an attempt to lure users to malicious sites, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://durgabas.coop.np/ckfinder/userfiles/files/rupum.pdf In PDF document text
    • http://danangsculpture.com/uploads/image/files/biwegixamuxupixefowolajiw.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/66510004428.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa754e6dfa---mexite.pdfIn PDF document text
    • http://elpijisystem.com/file/69044510764.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/rebivafosomuvuziduwel.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/82849057255.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/pidenilugokanudixodozidu.pdfIn PDF document text
    • http://boki.hu/editor_up/4866796213.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/81215254165.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/bilowulefupotogo.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/lexedu.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/34f7d04325a2d65dda18ed17f4d7500b/fepopapufokumoberaluki.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/teketefejowuvozere.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/23532396301.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/zixip.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614404e6019c5---bepomejalofukow.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210903075055.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/petomavupuwano.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/nibiberigegelakitajujidal.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/betakomopapizi.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/78680619134.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/33616143711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=venom+2+123moviesPDF 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_off0000d5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 18088 bytes
SHA-256: fb41b47f607be5ff5be1ce937b822680f9e21af566ff896e7821fbd3a824980e
font_01_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 10240 bytes
SHA-256: a1158e19403e2ed265a7455e9f3a257e6804881aab6a7b43eac8379a22c028f3
font_02_sfnt_off00011bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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