Malicious PDF — malware analysis report

Static analysis result for SHA-256 376c3aa7bc436ec6…

MALICIOUS

PDF

71.5 KB Created: 2021-09-11 20:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1fcb12be001de5b73eddeb8c629fde46 SHA-1: b3fd58473c9cb039c59ae1a46e4cc4c40f9a8815 SHA-256: 376c3aa7bc436ec68f5bf069dc5ba5ad32e4ae655f3f62b89409b4267cca1cc1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://babyshelter.net/assets/upload/files/melaki.pdf In PDF document text
    • http://oilmachineydy.com/d/files/15216857011.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/44657724544.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/84130879511.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/93841269425.pdfIn PDF document text
    • http://capital96.com/userfiles/file/28112942219.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/81168989727.pdfIn PDF document text
    • http://friulanapanini.com/images/file/kavoruvolekejoseduvowadi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16138dfc705608---87789146858.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/16218105899.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/57666018992.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/99086961952.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/kiwogo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136c276a82a5---96447386527.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/99241516495.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/vorimugolo.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/tekowov.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/55433365259.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/xikajefusidagawiguwir.pdfIn PDF document text
    • http://tercovci.cz/files/file/26262355352.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/sesebajimatorekalakonuvov.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc274a70ad---70797192072.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210905110422.pdfIn PDF document text
    • http://usmleworkout.com/files/file/lesexow.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/vamanoniganoxokojiremo.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/rubarudagikore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+delete+app+samsung+galaxy+s3PDF 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_off0000b5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F5 11108 bytes
SHA-256: 2ee42eb55bf62d55f156f47fb0041ef140a9645cfed4e03740ee3ed38ab92d31
font_01_sfnt_off0000cfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 15920 bytes
SHA-256: 08204f09a7812c65c9228f402f586ad0c18dfb13364c5ed0898f74317c29964f

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