Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0bf2b0f0e95776…

MALICIOUS

PDF

78.0 KB Created: 2021-06-15 16:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a259dcc0889bda91a8c8eaf9b09f2e6 SHA-1: 4525ec4f94d1b7859c0aa0198f6cff913cc09c7a SHA-256: 1d0bf2b0f0e957763160e34c4519eb5bf850127569c957aabc69c6e42b83f75f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=gusion+build+and+emblem
    • http://alexhoffordphotography.com/temp/files/file/36915211825.pdf
    • http://digemnd.com/UserFiles/file/13668523893.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d7a365305---lupixetifitevogotozo.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096021d55e7d---69762034111.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/cb1b40dc4628a929fc74e85774633c03/62478366560.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/xuxetij.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/0f3e2f1ca958b0fcbdc6b8bd3fb42295/38691521304.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6a1f2b6fa---68022104525.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/6s0ccmtr7pprb0t4d0mskfhcn6/dufukoko.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/a093bfbefa540cf77db726d7e082d632/pibevevuzezavavik.pdf
    • http://bettaletroom.com/file_media/file_image/file/padutosimapebonob.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d054931cbeceb01a655ef9b48129ec86/15900028420.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/2f6c54fc9a8263f18061e6172e09da57/valerolizijezipuxelugowag.pdf
    • http://smartvoicecom.com/userfiles/nijuwexafokaf.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ba91ed208---xaninisevamum.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/582464ab2be9c151f5396941dcaa7d47/xememivoxeda.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8d5c45db8ce55a8fd3529d5b66b5c541/mavedafolafezigurebafijof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ec.bin
9b727fcc2312228ffac330a675ff6eb7ab8d2b243dd4721c2c03a9abfc4f5404
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 4848 bytes
font_01_sfnt_off0000f746.bin
aab8fca360550360aef8edc84921b05f7e29d9edf8e47212ec24731ca0a5e8f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 11092 bytes
font_02_sfnt_off00011d34.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 4324 bytes