Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03518a7d689a0d8…

MALICIOUS

PDF

95.8 KB Created: 2021-06-26 20:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c68b0119a93fc6f4fc2c2a2cc4b2d7e3 SHA-1: cdfcafc5eaba96a9e6cc0150e004a36338cef74a SHA-256: f03518a7d689a0d8fb4aeb7320d52534fec41162bee5e305c5beeb39e27370ae
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or SEO manipulation scheme. The presence of multiple external URIs and a link farm heuristic strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://hakkabrothers.com/userfiles/file///12164184153.pdf
    • https://vinacomvietnam.vn/uploads/news_file/xelasezapu.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/af07e105c77d3166b9143ea8545bced8/73932736634.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/pejuvateretowuriwaro.pdf
    • http://myphamhelios.vn/luutru/files/58643981534.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/torqnmoe3h1d2v1a7t61mkqmqh/jonixosonajixesilujivas.pdf
    • https://bhsbeacon.com/FCKeditor/file/bakigup.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec11298e7---47261246011.pdf
    • http://poltinik.ru/userfiles/file/87287536623.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077be7c75ae6---28424817549.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/0975d7a008283580838514f8ed8ef557/dojexewetovoretovo.pdf
    • http://qtjdb.com/UploadFile/2021/06/17/file/20210617_210022_112.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160815e66a1049---rufower.pdf
    • http://sys-svinding.dk/userfiles/file/25659428182.pdf
    • https://volgogradexpo.ru/ckfinder/userfiles/files/gunojelokoturokezunoje.pdf
    • http://trendybiz.in/usersfiles/file/fagamozufite.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876ce4aa5d7---10358199827.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7c407948f---66533293456.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/120e27494fdefc8a77a67ac86b317e3e/fadonotaporowu.pdf
    • https://thefertilizerequipment.com/d/files/5268305506.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02166efe51---zutosarulabatexat.pdf
    • http://fujavietnam.com/images/Download/wejekenutetasobiw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff0e3f327---61736439615.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d3671a3f84f---52484154080.pdf
    • http://brilspa.ro/userfiles/file///powujuxatigavexisomexa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+dragonair+in+pokemon+go
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9c.bin
208747fa9854260cb061d76e88cdcfec1ee8c0cf80286f4b1a410b3db45d427b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 3376 bytes
font_01_sfnt_off0000fa0b.bin
f4cb07dac9515543ed62b49c1d36f068e963f53b0acd9d97f168956dfa4760d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 10692 bytes
font_02_sfnt_off00011258.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11258 16792 bytes
font_03_sfnt_off00012a6a.bin
943c45e58c2b9331f6c7755332312bcadc3f0106e1e6aba577346dc1e10e4773
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6A 19468 bytes
font_04_sfnt_off00015ba7.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA7 16092 bytes