Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f5a15a60f7ad5c…

MALICIOUS

PDF

120.8 KB Created: 2021-07-02 02:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b89c1e965405e4d00e2b01d737d8f3c2 SHA-1: bbab12cf161ed9dac91ffa4811563394ad2121e8 SHA-256: e1f5a15a60f7ad5c6144c4c5fcae081b31e98eaaae3ab0fc0ceb03c4b8ec9712
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9858

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 https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8f9afba035ed9ad36f6fa84815f12b16/51126453985.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/vudejujurukagexafevisoji.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c3cb4cabe---matufutipuv.pdf
    • https://lesfeesdelhetre.fr/upload/files/38834086294.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/mssstp1pe4lff97tell57ogl2a/82222423773.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/14060e4fec89a35a583325e14182406e/kazuzikerun.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769329a1af5---71739757321.pdf
    • http://driver-jazda.pl/upload/file/80415632402.pdf
    • http://flirdining.com/uploads/files/62572226382.pdf
    • http://tmfconnected.com/clients/6/67/67cd703e63b47da0cba1438f70967d25/File/dezujamageleritepomefojor.pdf
    • http://vintageguitar.ru/ckfinder/userfiles/files/96905365380.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094087090f64---zowipugodiwaw.pdf
    • https://bostoncake888.com/UserFiles/files/tiwor.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/3325660543.pdf
    • https://grupahatak.pl/admin/_fck_files/file/5984638019.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/zupub.pdf
    • https://infiniteprospects.com/FCKeditor/file/9766650511.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f62e807ba---26552483016.pdf
    • http://oreade-breche.fr/userfiles/file/zurilokusaguvudifulikubek.pdf
    • http://golden-candies.ru/webroot/files/files/1159757720.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc650069ea8---tenidev.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/mnu2e9un0jvq7rneuts07ros51/24863923139.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a6e938588---piguseruvukelixizegofo.pdf
    • https://groupburuemas1.com/contents//files/37027370095.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4ff6cb25b---78393966154.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210527_966A994FD8ECC850.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=thermo+king+magnum+service+manual
    • 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_off000171f4.bin
9ffe132fa6c2c694077ffcb87887b06e765b6845e2edeb2a75d5d54f09008e2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x171F4 10800 bytes
font_01_sfnt_off00018ab2.bin
07ceeaa272b7286daba18dd836e2d1e647ed9af9fd694995fd02438e27510e90
pdf-font-stream PDF embedded font (sfnt) at offset 0x18AB2 18740 bytes
font_02_sfnt_off0001bc5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC5A 16792 bytes