Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb53677a7392496…

MALICIOUS

PDF

93.8 KB Created: 2021-07-24 22:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 90e27a693c0c75d143409a79e00a6f74 SHA-1: 5d1d118dae9f3410346dab4fa0b62a9f0a39997d SHA-256: cbb53677a7392496a38e89d23ee4fc2398cfcac0cbd034d5cef156edbc0f876b
184 Risk Score

Malware Insights

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

The PDF contains multiple links to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of a 'download' button lure further supports this, aiming to trick users into downloading a malicious payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dekoblickfang.de/userfiles/file/rawuzitatow.pdf In PDF document text
    • http://daoltrading.com/userData/board/file/tudibelulepujasari.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/bajasotarikobafobi.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/20645795427.pdfIn PDF document text
    • http://hifi-markt.org/kunden/kronhardt/ckfinder/userfiles/files/3339394193.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969e446bbbb---tudatunesuxegune.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/37294124509.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/95248837821.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/tusopekurefasixodona.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16083faa4b5998---46781126505.pdfPDF link annotation
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/6fc588f1e6d3fc69de9f3d1bedd40c59/mawidaxezukumenosam.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/japafupogazeneze.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/lezusawijadobuzol.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/68996672700.pdfIn PDF document text
    • http://abnicum.com/files/file/lutukib.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/sewikumogizelorore.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608f410922f3b---56502920407.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/42285880262.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/71533077833.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/91119013046.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/77060238885.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/porevanumomifojefuv.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/bugivomojinuzefopobekiw.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3j7tfegbvmskk2t874ielpqg07/16090646549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+reading+level+is+percy+jackson+the+last+olympianPDF link annotation
    • 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_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 11356 bytes
SHA-256: bb261fb2c2982bea7a1bda2fffdd993765748f55b1807af480de64dc5ca48674
font_01_sfnt_off000122e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E9 17460 bytes
SHA-256: ee43f3b9b7461231b294c186ee9749a1487d84eb42312889db0b949dd7655ee0
font_02_sfnt_off0001506a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1506A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1