Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd83a5bb822cad05…

MALICIOUS

PDF

71.6 KB Created: 2021-09-01 22:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2a4e9a8668c4e0ba16cddc872d87e2e1 SHA-1: ebe72add38c93cc6a848bc1b8ed3bde53d0cc3b0 SHA-256: cd83a5bb822cad05230fddbf5c7722a0c427d9b7021e6a15ce549a424c50780b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://tikatalog.sk/_files/file/negabagopapabakekajoxezan.pdf In PDF document text
    • https://podimercrm.com/img/files/77400062122.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/wapusafoloselaliwipebeve.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/142271771ff9dc0fbeed26d26a207891/bapofiwetotovuzomug.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/dezalimuruwejofeloxate.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d63fc13326c986e2a3f8a23e127bcf3e/basepokuwujubixotira.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/64685341001.pdfIn PDF document text
    • http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/vuvusonerexise.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/d2n3q902klpg2vetfqrukmp9p0/97321376845.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/4b428fb9bc81beae6cffb9028fa85294/19419470758.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b2b0545c8---ligopexojapewatogotedat.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/14252997274.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f3bdc5149fbc9d88fe27a76a55a06ba0/92337754146.pdfIn PDF document text
    • http://ligneus.hu/upload/file/93235663907.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/lududogikoguwokifomivanif.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ddd818b445b7514835ca0ccd808b7e34/zitomozuluwokixages.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/farep.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/gabadarivima.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/vemamususegopan.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612650bd750a8---wejaxibakovuri.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/gasevuwizigefub.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/frscr62oed1tu984m3j6ok4rce/mevipoxevoludobadifuba.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210523084516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=on+gta+5+online+how+to+get+a+girlfriendPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/54163861336.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/duronerirexonasunopemupom.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 14368 bytes
SHA-256: 8f294bc52567d41a0643215f079c79e522fccdc14dc79839862769e4ceb68a57
font_02_sfnt_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 10708 bytes
SHA-256: 5f8738ac5b7f35a1cf44ec993e46f1b8a38757cfed3e4bc2de6ffa39833b511e