Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb68444b0953a15…

MALICIOUS

PDF

74.1 KB Created: 2021-09-27 22:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0a11e16a2a539de1b5e436304c8bcfb SHA-1: a23789fd8d2b1847b46ad41f12a486b254ff1cf7 SHA-256: aeb68444b0953a159d939e4ce680e4316e77292dc50f7e2858d1045c3e10e607
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d116e6255---1576846388.pdf
    • https://tradingcall.in/ckfinder/userfiles/files/35866269122.pdf
    • https://oancora.com/ckfinder/files/29268721422.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137e58a919ba---3086873186.pdf
    • http://topbuild.net/content/xuploadimages/file/32726855115.pdf
    • http://ieeepes-thailand.org/app/webroot/files/files/pomezibazifetowasuwufoxo.pdf
    • http://eyupsifalibitkiler.com/resimler/files/99276968236.pdf
    • http://forepic.com/_UploadFile/Images/file/65913263994.pdf
    • http://asesoriazabalburu.org/azaba/files/file/99223368539.pdf
    • http://naphotelbangkok.com/userfiles/files/56030108686.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/33db832bcc6ebf8158c4d7e151cc6b9e/90210623634.pdf
    • http://www.iciparis.ru/ckfinder/userfiles/files/94983962248.pdf
    • http://coreaad.com/DreamDataUpload/file/70053585941.pdf
    • http://propertiesforrent.com/userfiles/file///54238779923.pdf
    • http://surtek.biz/image/files/20150329_023709.pdf
    • http://xinxinhouseware.com/uploadfile/files/37225183696.pdf
    • http://everestlodgelukla.com/userfiles/file/xejozubalobuf.pdf
    • https://brawlcall.com/ckfinder/userfiles/files/kowawusotobanepuzuperivub.pdf
    • https://mgs-on-track.com/app/webroot/userfiles/file/milufarilatemore.pdf
    • http://perilatomsk.ru/ckfinder/userfiles/files/69243923645.pdf
    • http://dentistturkey.com/image/files/puxakajarolunam.pdf
    • http://kelvista.lt/images/files/xavesizozaxuvavujopoma.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/21665078520.pdf
    • http://gaishachuukobuhin.com/js/upload/files/satebisetenipe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=adb+driver+windows+xp
    • 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_off0000b6f7.bin
62f3ebce46fa3329b11e755380447f493a2994064516a36bdbdc74b99ba395f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F7 19864 bytes
font_01_sfnt_off0000eb12.bin
b1b91c0913852541b868bf60c99fcf7697ba4708995261eab36626e44bd82a39
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 10452 bytes
font_02_sfnt_off000102c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 16792 bytes