Malicious PDF — malware analysis report

Static analysis result for SHA-256 aebf6f3e82ee1c10…

MALICIOUS

PDF

106.5 KB Created: 2021-07-03 21:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b629835cafbbeacfa92ba7be71ac40b3 SHA-1: ab20e53090cc54aeae55c00b1d1885fc128d7684 SHA-256: aebf6f3e82ee1c10f83737d3a3a844adfef40a029219090f643a8c37c13e4a40
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on potentially compromised websites. The presence of multiple links to disposable hosting and compromised CMS uploads suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9813

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://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/f90723531a8c7e00275fd7c3585830ac/vawon.pdf In PDF document text
    • http://au-zlato.sk/upload/files/3674433964.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/27523389957.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c7540edbc21---nulenobag.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/13569909674.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feaccc39ab---38289170149.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/81976977314.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/34b31b5cef60ce48cba30faf4d40b8bd/ziwafapawekaxener.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/jagekemizutubiwuvu.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/9uaqt641emes1mc7237c03q084/23546799022.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b3075ebaa---mewepuliwapisilogemu.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/55203733646.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4182605d5---85426803151.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/17589374055.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1490783c---mekebuja.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/80258385209.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cb0fb5626---remokivulomekonexapilut.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/99b01ce9154eca382ae160a8be619b9c/91981552417.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/xovegolufobewigakijatola.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080362494219---84118042740.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/kuralumurexikafoli.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae19b42caa2---laturabulixivamevusuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=english+in+mind+2+student%27s+book+pdf+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014136.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14136 22068 bytes
SHA-256: e39608a2cdc7dce7b756d765c5f6b6ca02c7740387f11398f208a5463b113cb2
font_00_sfnt_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 11500 bytes
SHA-256: 701c775ac32401a0aeaab3a5b515e253beb22021896e087caf6c54ae77d7ca1d
font_01_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 21800 bytes
SHA-256: f690500ad0a756556048b0ee32770e055827ac306f346b04500d5c409403c853
font_02_sfnt_off00012925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000168e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168E0 16756 bytes
SHA-256: fc9e8bef9a32a9d747a41a2da9848f51adb9e83f79984c33d05400772016f93b