Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41c438e26c1e0f9…

MALICIOUS

PDF

87.6 KB Created: 2021-08-21 17:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc370d30eb429a2148b5256bd35129cf SHA-1: 8d970e2c0a287f610a3fbb195f0ec3e30ab617b3 SHA-256: c41c438e26c1e0f9ff8503d1ef0c55d744a945c3c4d13c09189b4291d3380f47
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on various websites, some of which are compromised WordPress installations. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/74e515a36326ab3bb5131317d4d70465/xabapomobawurodemadat.pdf
    • https://balbok.net/admin/ckfinder/userfiles/files/pitevavebodefum.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/13428a2e6f5f194bc66651dfa58fcb78/xamemazolazapa.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af8886f0195---xegegefevup.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1594d03e74---83440354633.pdf
    • https://facades-et-traditions.com/actualites/file/xasaxilarijidideg.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/fisiz.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ddbj9pesmefvgloere6lsjfcm3/sawozixonosixa.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/83c826c97ee1db5735d917da37bb7499/26481693419.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c34442adbbc---mavopimokegenowogobat.pdf
    • http://bjerkelunden.org/content/files/userfiles/file///lodojolulutofurewimezaru.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/g0nb0aau6jo7rc1nvr5e6figg1/90743463170.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/7nf78j5q1443gd9rmalvn5cbv5/xexagofalidituti.pdf
    • http://st-communications.com/ckfinder/userfiles/files/pexorebuponirugemogogebe.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/e019d470ca8768efd6bfb48a0976e4b7/37782478720.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ea3920ddf3c30fc1bfb6df5ed93bf7ea/72890823977.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9ubb30nsen6rn7id96048fvkr/3246480955.pdf
    • http://mynigaoe.com/upload/file/20210808154248.pdf
    • https://granitnet.hu/editor_up/55082831918.pdf
    • https://jmcoverseaspvtltd.com/uploads/files/tozudefarojenulajiwoten.pdf
    • http://evohome.pl/userfiles/file/bevafovadajufijukutirot.pdf
    • http://rurisnet.org/images/file/gupusezuvewogon.pdf
    • http://ndt-ultratech.com/files/2820651153.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=hikvision+exir+h.265%2B+manual
    • 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_off0000eda9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 16792 bytes
font_01_sfnt_off000105c0.bin
148fdef2c51d0f944a5efc259edef650d321f16ca83c4f4bdab1da727e1ece15
pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 11112 bytes
font_02_sfnt_off00011f89.bin
007f2a6aebdd8db1bbefd846f8ca16ea064bb53649f5ff3242bf7f3d0c3e0deb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F89 18448 bytes