Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d19d627264efe1…

MALICIOUS

PDF

79.4 KB Created: 2021-09-23 07:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9416bd8925a21556cb5573573e58b9ce SHA-1: a48734f049c0329c958d7ab7a612758390253f63 SHA-256: 63d19d627264efe1f703fc86b5fe9707a340019664e80956a96892e91fbbe5b9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161498022ae497---naxunewojevirunizumil.pdf
    • https://codecs.ro/images/file/liwumoxa.pdf
    • http://veganogle.es/uploads/ckfinder/files/dikedexisezorunujumigasim.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1a85cdea14aff4980ee011eed87192a2/fesikowetadatamuzaxu.pdf
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/migavalozadikobisoliz.pdf
    • https://saatyapi.com/upload/ckfinder/files/53619751456.pdf
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/44836871554.pdf
    • http://abc-tel.ru/data/File/vokoburoderejabeg.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/480enhppj8d2ke59prku89h1p6/19118723937.pdf
    • https://reparationmobile.net/userfiles/file/2257197228.pdf
    • https://begili.com/uploads/image/files/nexuloritugoluv.pdf
    • http://alibabashipping.com/userfiles/file/jubuxufafusasuvezibexotus.pdf
    • http://618tuan.com/uploadfile/file/32988012704.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/jusopuzibes.pdf
    • http://skiflogistics.ru/userfiles/file/60681927318.pdf
    • http://tjsyjdq.com/v15/Upload/file/202192124956936.pdf
    • http://immobilier-valence-agen.com/userfiles/file/73103298027.pdf
    • https://balaji-technology.com/userfiles/file/43424225023.pdf
    • https://onthespothousing.com/userfiles/file/8494921264.pdf
    • https://mallorcaboom.com/res/wysiwyg/file/55311233610.pdf
    • http://sithome.com/upfiles/file/20210921124955.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143218ccc8eb---zivozatenabivemudowavino.pdf
    • http://www.ez4parcel.net/upfile/files/2021/09/09/96340297316.pdf
    • http://georgewongdesign.com/gwd/upload/files/62679951676.pdf
    • http://baobianhkhang.com/upload/files/33392048297.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=aot+tribute+game+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d326.bin
ea2124f85b01309d4c27e35d43c5f2a757c77703de3cb4b512ca4d00e4fd201e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD326 17352 bytes
font_01_sfnt_off00010062.bin
941f44a66889f024033b41c5e99198a4a37a4af37ee7c190f159c7c8dc936b85
pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 10504 bytes
font_02_sfnt_off00011841.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11841 16792 bytes