Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cd554886160ffc…

MALICIOUS

PDF

77.9 KB Created: 2021-09-06 23:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 857110835bc7f547d7455618bb221033 SHA-1: 8ce77d5c8fa2f499a911f1f778e4deeb27746e03 SHA-256: 24cd554886160ffc6ccdb307d8188397a16365eebdda879e83823283accb4c4e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs pointing to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=fetal+growth+restriction+pdf PDF link annotation
    • http://xsjsbzrw.com/uploads/files/gabobolomurifikelenox.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/somapoxod.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021072416360876693.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16120863bcfc54---pilepepabobol.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/79723862567.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1r4pltgfq238jhbfrm7tqbje04/12163546919.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/6014879513.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/280c0cc93bc8b31f5701026463ef1077/jalujomovi.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/65863693665.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/267e8e1f716e61d719762a958a677569/98186750469.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/smrir6990b9gh4nbdpn1c3pgnq/vebogepofodukanilofoxiwi.pdfIn PDF document text
    • http://jagamimpi.com/contents/files/73537578661.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f70347a49---14366372303.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/48387491171.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/36539966233.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/ruvus.pdfIn PDF document text
    • http://vtaky.sk/media/file/buvegopak.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/27272010016.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/qe76m6ra48pdqpgjemqphhgqo2/63524274868.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/84994956160.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/vidutonujimewafegukif.pdfIn PDF document text
    • https://afayl.com/userfiles/file/waxuwilisu.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fa6c225f6---xibexojijifiziweresifus.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b93ff6ef131---kerozumuzejapufadas.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_off0000ca7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7B 10960 bytes
SHA-256: 66c2a33fc960f498ec2cc9db506e778b92db924b96e617639a43b72b7561932e
font_01_sfnt_off0000e3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 17864 bytes
SHA-256: d2d7a7baf5195595add9c4378824239462c2bdcf59d8d2d2950b47db7ae7ae51
font_02_sfnt_off000111bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.