Malicious PDF — malware analysis report

Static analysis result for SHA-256 613a885836556cae…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 04:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8bd97d1f2ffaa0193a115c6c433d6b4c SHA-1: 511be2c58c261887adeb9075ea93f61db0599852 SHA-256: 613a885836556cae8b91d0746f8e6ad76c134a84b7f3e15bdf8dcba8f97d98e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=elements+with+largest+atomic+radius PDF link annotation
    • http://iknow.pl/files/file/xapolulav.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/linijugobu.pdfIn PDF document text
    • http://jawarakreasi.com/file/ruwerepu.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/xumagune.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/99862748220.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/53291827208.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/96894083748.pdfIn PDF document text
    • http://hidramaco.com/files/files/rekunobutetaxaromope.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/19192095215.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/visopawefivuwasegekituru.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161303669e1165---88677232313.pdfIn PDF document text
    • http://artospace.com/pics/file/fotejesetafalasatagi.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161428ca603e09---modarujubu.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/38317139108.pdfIn PDF document text
    • http://thegioioto.store/upload/files/zuzekaborowa.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109010630545966.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/12200822520.pdfIn PDF document text
    • https://afayl.com/userfiles/file/43809194954.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/71717400598.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/46331143658.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/joxuzalalosiwunafuzon.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132264e957fe---49701702614.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/64600189086.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/pududowavizijow.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/zapojaraje.pdfIn PDF document text
    • 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_off0000d8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 10984 bytes
SHA-256: a796e2b9f0b7854973027aca819f155ce6d33140fdadd2258906e90276c88fbe
font_02_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 17952 bytes
SHA-256: 61e63b39565f71c015ee0a378e3018193f43d3e5f3a237c6d8c37aa275e2cd59

Open this report in the interactive analyzer, or submit your own file for analysis.