Malicious PDF — malware analysis report

Static analysis result for SHA-256 055edd7a737dedc4…

MALICIOUS

PDF

101.1 KB Created: 2021-06-26 15:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4e0f3a0bce1d8f916acd49060284dcd SHA-1: e9c30209cb962249952126b7313270be8dbfa082 SHA-256: 055edd7a737dedc44ea05b46afbfb52ec090c5d40a69fa7f22cf57440d9f6b3e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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://rosenstein.lu/userfiles/files/8219332605.pdf
    • http://www.annaleehuber.com/content_files/file/fegeziwizomiv.pdf
    • http://jucal.es/images/file/dunoramutifiveji.pdf
    • http://nomaquito-travel.com/editor-images/12272944140.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/355c0ebba8616817629a0fc1431b9c56/savazujen.pdf
    • https://acronimocostanzo.com/userfiles/file/papisikuz.pdf
    • http://terezmisszio.eu/files/file/75937401804.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098b4bd178db---nimezitumefilosipaxi.pdf
    • http://archinfo.ru/uploads/file/ziresonu.pdf
    • http://toshiteriyakiburien.com/uploads/files/54840640683.pdf
    • http://childconnect.com/swi/fckfiles//file/54009503420.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/nujefuwojoraxujumidaru.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ca345458ffd797923cc3686743a9fcb7/27240490933.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a063a8709---70704922904.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0fd1384fb---68165294934.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920cbe55a1c---jokezezegisazipezazipubod.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb15b8ed3e---zolakil.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5803aa1bc5---62369355429.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab681c04caf---wapewatevozilosap.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b8f154c22---4973347413.pdf
    • http://shangrilayunnan.com/ckfinder/userfiles/files/30082283581.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb740e4ab0a---11612224795.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e136097a7d3d2c8fd469541efa10065b/27161946617.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=red+shoes+and+the+seven+dwarfs+full+movie+free+online
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076142a7c80b---50432198685.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106df.bin
e56bba586f25b7bb331306cce9154593ee2e022724dfd3cbe2c17502343e7eeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 1784 bytes
font_01_sfnt_off00010f3f.bin
d7cd55395ca8c5b3ded2e9f44cdcfdf374181edfe397b2f4d7fa01d4c9eac515
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3F 16280 bytes
font_02_sfnt_off00012560.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12560 16792 bytes
font_03_sfnt_off00013d77.bin
6056f3032581c9968078422fbdc25651315fbea59ea7b8b4f6fd4a77e2287ce4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D77 10916 bytes
font_04_sfnt_off00015697.bin
5ae07983a0e00b33eafa5f6ede6175f6559bf31de5220f6b913a74e0a54175b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x15697 17772 bytes