Malicious PDF — malware analysis report

Static analysis result for SHA-256 62023930aa57d15b…

MALICIOUS

PDF

74.4 KB Created: 2021-09-19 10:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f403dce3b9cf3e50f353f52e894b842e SHA-1: ae12ec905b72ee1376f2eb6b4061c82097c27f0f SHA-256: 62023930aa57d15bded57eef1250e44520c9c2e7c53ad99f0ba08683773dcaa5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://inwebjor.ru/uplcv?utm_term=2013+sylvester+stallone+movie PDF link annotation
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/9407583081.pdfIn PDF document text
    • https://mavibusiness.it/file/52737626600.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/losazikusumetuloxeji.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210916_025732.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/98576581749.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/liguxilufozowobiwu.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/92406129543.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a49177debe85ed6e1133d6026ff8e4d2/45006026654.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/fugom.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/misenozigotujujogux.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/53965475748.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16144536e23e45---davojimutomo.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210911023045.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/kuwag.pdfIn PDF document text
    • http://freeski.hu/freeski/file/saturemujojoru.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/tuxuwavus.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/78411682440.pdfIn PDF document text
    • https://medius.sk/userfiles/file/zegapezogoxodup.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed92f37a1d---11842104955.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/zelesamerefodovi.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/majazinalul.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140157984a54---xejabexesuzemofelifajofa.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/78f4e870b502865553d94f9906ce2543/59537705329.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/32003753056.pdfIn PDF document text
    • http://raczcsalad.hu/files/bikewagoboferugosixemag.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/vomew.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_off0000bc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC23 17272 bytes
SHA-256: 6ac49acbaeff2863f7157eb83fca1d7bc7d2cdc6ab1f06fe17c2573a0196dcdb
font_01_sfnt_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001010a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 10820 bytes
SHA-256: 5684c81fb3c41842574c1bb7fd109ccbb9589b995283720bdfae10dbaed3a388

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