Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ac82d9132ce263…

MALICIOUS

PDF

103.4 KB Created: 2021-07-05 03:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a10a7d363e0b03001072eca2cd36cef1 SHA-1: 28494d81d3cec62499876e4c0162b9ea879e8f26 SHA-256: 43ac82d9132ce263355e012472280086bdb479863523f2698f6dc989d7f3a42c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/kmi8t3r0supv2o1kvr66gcoo7e/53608732232.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b01d140421---wajelulabevugojuxonapewiz.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/n5cv4aj4nuvu13n1bb4ohrng15/dadizarikinilik.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/37ebc6f643ef89839093c420b89217fb/11673138032.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a449853f1c9---33988668684.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d49551e10e9---zosesosukefafonom.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/08af14abce2709be5980863d271d58fb/64339808219.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607186344984d---pedolejetuv.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c71f6583d1201bcb2dec3cde0367df6f/58955863437.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/cf912bc8744009f66e16793bd3b18a00/88682770357.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609518aa83e29---67934916476.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/paxeratezovijifepik.pdf
    • https://nevisnews.com/userfiles/siviwukebawelasagojuvepe.pdf
    • http://cayxaotamphan.net/userfiles/image/file/waposisofa.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9bfec2a0---gawupepuxokokojawag.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872de2c45f7---44141353538.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ad3a47dd8---lavozozijumane.pdf
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/nemesoxikero.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d93a42fdc---xonevosidaririb.pdf
    • http://nacyc.jp/Upload/file/dezulufilonadabete.pdf
    • https://emmaushuis.org/pages/65595365660.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16088a436989ba---63611995903.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/4dkim59kuvdjpkncvlg9vkk81a/davutuwozisimefej.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=skam+with+english+subtitles
    • 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_off00012ef3.bin
d2438c522bbe02c7d21e2721e354ebeead85018752a6c31fbf317f253dc22e89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF3 19712 bytes
font_01_sfnt_off00015fcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FCD 16792 bytes
font_02_sfnt_off000177e4.bin
dacceb1eb9d25e9cef145ee8fbd5f114f28c2059db29c9de9959f9312c321d22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x177E4 10828 bytes

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