Malicious PDF — malware analysis report

Static analysis result for SHA-256 659b15a3dfcbd18f…

MALICIOUS

PDF

73.4 KB Created: 2021-06-29 10:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68aad2e977435c18db3bab69576bdc61 SHA-1: e58087f4d02cd73413b5c6f7f52efd11174979ef SHA-256: 659b15a3dfcbd18faad10ea305b29424ec578c6562e45aafa9c76e2bf3ffd2b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised websites. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or malware distribution, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa68b2a9229---86934128453.pdf
    • http://3suntech.com/UploadFile/file/20210616210151324.pdf
    • http://efuegypt.org/userfiles/file/77545566908.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2dbe556dabc6ca8da96fa41bf52665e8/73296123573.pdf
    • http://kpdb.org/userfiles/files/17788984274.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/06fdcf9197f6a790378f471f721b6076/8789462744.pdf
    • http://breakevenpoint.pl/uploads/editor/file/19259632511.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/371a97eeb9fa0de262f45238b1f6745d/zopomusowakabilujisefelu.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/h5n0807hn578urgrru9ald7aa5/35916310705.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a769c8a14fe---gedopelef.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/aodlqfsoqiu147smbaord6blcs/pilitezotugetorolep.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1251d7249---fumilo.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092043d2b306---sugunirudama.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62d0daba9---53925719706.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/pp675jfqq6kife1ljgc5sv0ju9/3992138931.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87b80959f---45541631283.pdf
    • http://www.flamanville-76.fr/upload/file/38106199336.pdf
    • https://vresponse.net/userfiles/file/61285229264.pdf
    • http://apluskleaning.com/admin/images/file/kepisatulazilow.pdf
    • http://hanboo.cn/Uploads/file/2021053110465270554.pdf
    • http://learningkey.org/userfiles/77400427352.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a55d2496bc---13987354373.pdf
    • https://mszukam.pl/dat//file/pumiwudagozupefid.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b00d3694a90---80569860880.pdf
    • http://edbcagliari.it/file/29676192855.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=portfolio+management+multiple+choice+questions+and+answers+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc65.bin
2f489b1420dcbd04d430ca749d158118651671b61fb0cea7780ee6987369f4ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC65 15948 bytes
font_01_sfnt_off0000e553.bin
7a611fcd0b64ccd472c70cf964d56b06cca622a248d0f4d4bcad9eac2f984585
pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 11400 bytes
font_02_sfnt_off0000ff93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 16792 bytes