Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea718c96d7324a3…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 15:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e55190aa4e1ab088fd797a9414dcb486 SHA-1: ec90c43952bbc52d1be4c5d5add064e79ec728eb SHA-256: 8ea718c96d7324a32dcdc66a7d40500cc41217356c493c590382fa50b953bc0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URLs, including those hosted on compromised CMS sites and disposable domains, strongly suggests a phishing or malware distribution scheme. The embedded JavaScript likely serves to further obfuscate the malicious payload or initiate the download of additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=top+video+editing+android+apps PDF link annotation
    • http://aasghsflqsae.handylover.com/upload/files/83787077516.pdfIn PDF document text
    • https://goodline.by/userfiles/file/funexagabiruwozezax.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/safomotilugepitijejuvez.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/17441301323.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/vesitemiledojovizatu.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/45618168649.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/mimuxulawubidofav.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0036248a381c3fff67cac62d535e3300/28839829149.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/38593933059.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/xizokufejawotipanewosulo.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/53010783883.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c3c0dd02c---negapawofobubawuvi.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/bomatusamub.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/85850814999.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/kuzenivoteb.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210907160223553390yeu7xx.pdfIn PDF document text
    • http://millecolori.it/images/file/48768608515.pdfIn PDF document text
    • http://rcmo.ru/upload/files/natobufabobinolodofixiliv.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2074c28c---rigarox.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/mivamifaj.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/41126503435.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/47050925018.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210914155136.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/fibavenikezudadum.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_off0000e20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20D 16732 bytes
SHA-256: 67ab7dcfb3610a04530606ef1eaf6db229d4f5672b8422c699a6b45cd816fb98
font_01_sfnt_off00010d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D76 10548 bytes
SHA-256: 778f23fde2f68a3882cd781e921c1e04b6d7bb3c96b8578717a6bafb20424d00
font_02_sfnt_off00012577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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