Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cb1c492e32bbef…

MALICIOUS

PDF

71.8 KB Created: 2021-09-28 01:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 612ee5aa3bc524a53397649f9ee886c9 SHA-1: 394d8cb9ec65802b37119b4979ad5423aa7b1a64 SHA-256: 53cb1c492e32bbef3907a3c0b331b44f62184aa34b07409e333e078521707cd8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads 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.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://crewmak.ru/uplcv?utm_term=export+text+messages+from+iphone+to+android PDF link annotation
    • http://songpinhao.com/userfiles/files/89638758839.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/13422803610.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/88963354127.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/799525684.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/gdbuucftebrrj9bfgonq2cv2g1/pitixekolo.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/kiludajiraximi.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/48699110124.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/xesinozezixo.pdfIn PDF document text
    • http://icareonline.net.au/ckfinder/icare/files/boveviridaguzuxev.pdfIn PDF document text
    • https://kysig.com/app/webroot/userfiles/files/83325981930.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/wumamuponatajajem.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/kabiziduzewalutugejowop.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/mufulox.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ck7br4b7oqe35t5gu981uj65a7/38139096086.pdfIn PDF document text
    • https://codecs.ro/images/file/rejaledosewi.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/30013235081.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/2419575194.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/lusilije.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/fozugegazubomewejeb.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/38939586661.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/05092211698.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7ca1a907df33caef24d4852308aa22a7/punoseropovo.pdfIn PDF document text
    • http://myphamasia.net/upload/files/degoliraxu.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_off0000b4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DF 16948 bytes
SHA-256: 8e1d377be0c623d0e5366524b628c5bba9af597c76a5fdd3b192a117b5976ead
font_01_sfnt_off0000e02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 10984 bytes
SHA-256: b74feecd1f05b8defe62a9fefda1981fd7b742c855f9b6465f70356e568ab924

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