Malicious PDF — malware analysis report

Static analysis result for SHA-256 781eeeddf7cfbabe…

MALICIOUS

PDF

98.0 KB Created: 2021-06-28 18:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5b42f78970ddc88aa857bf3cb8f2ecc SHA-1: 56a18dfa760ee08f37273687bcab92dc2cb4d72d SHA-256: 781eeeddf7cfbabeb6cf5fea174abfbd27064ca2632e32fbcf272ea0c9ee698a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites hosted on disposable or compromised infrastructure, likely for phishing or malware distribution. The presence of embedded URLs and the PDF structure suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://atya.eu/files/file/jegetow.pdf
    • https://prairieroseclothiers.com/FCKeditor/file/finuwozasoseriteguno.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a00c2e5e2---gemulewexikupekalibes.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085494652cdb---xaxejofipagupete.pdf
    • https://adepotcustom.com/UploadFiles/file/20210515015548131.pdf
    • http://www.ks-zahnarztpraxis.de/upload/files/gabajabetidoka.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608143227f079---kalilajorabeluwopik.pdf
    • https://easybuildapp.com/files/uploaded/files/56235892240.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b325e79c11a98771f4fb3cf7923c968b/74388514054.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea50a9869edce00e45d7c3c4460b2357/71892075749.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/6993ed138c6781f7d854c15771677c20/24741414356.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/bfc08acd13aa623b145fbb8d148b7640/413741156.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f28b220641---95524035319.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efaf690dc0---53298957878.pdf
    • http://nappsa.org/userfiles/file/tavalelaferorijujujez.pdf
    • http://glotecgh.com/upload/editor/file/vizibepebekodafik.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/34372594415.pdf
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/wijuwepatawujesir.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/gio1mfohm15tjc6naal4d14mid/49955148731.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/d6d68b21c0efb30795f95ba01e7fc68f/wiretexizenozozavevenopo.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1454736b---wedobor.pdf
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/de1d1442b7940da1989b46ad46eb7cee/74741470024.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=carrington+mortgage+mortgagee+clause
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4415428b06---17743550371.pdf
    • 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_off00011af9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF9 16792 bytes
font_01_sfnt_off0001330b.bin
678b1152f67fe5cdd13e6f1c45fbdb2c5157fa46171d3a6a3718e24327a97ebd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1330B 18140 bytes
font_02_sfnt_off00016214.bin
3e64028f3ea5af62d4b7742501be93870e3318c231b59eba394fa7eaf327d6a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x16214 10704 bytes