Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b31c4393953e81…

MALICIOUS

PDF

81.5 KB Created: 2021-07-18 03:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 6f6f9b280300543c2e56fe567d7a880f SHA-1: f7a21c546cd16a7ef31776fe03cb7be3a3136808 SHA-256: 50b31c4393953e81764eb25342672d36220baffb0184d7c62b62729d2fc4f502
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting it is used to host and distribute a secondary payload. The presence of these links and the embedded script strongly indicate an attempt to lure users into downloading and executing further malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b644710f094---43892033918.pdf In PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/95fp37rk2gt617k3q2avv3igk3/buwolet.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa42a744ff6---dipanoxerulusabetedeza.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/kaguvejokivozorawudefovaf.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/16886313506.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac51a2f51---8051344419.pdfIn PDF document text
    • http://gapp.fr/medias/files/pivuwuwafoluwasexugipuk.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/551946054bdbeb7f304a887bdc982e7c/sibusenupimovu.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/tajuzinabu.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/gikesunobusaxemibileze.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/zotopi.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/netoxepavulisiwag.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/fuwolor.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/7najevuh7n3agb211jc9ec2iec/rosupeweduruz.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/78114763378.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/85431122332.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/kefevomuvepodejufev.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/768ca9f8f3d2f29ff72e9f17c44d1817/37484408775.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/nowasipipesije.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f968d391d---4966268380.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/revitefiw.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb2d9423e8---26148511017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hp+2000+notebook+pc+user+manualPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 17040 bytes
SHA-256: 8d631760b3a18ef957991bb1a46a9cd5948b4df98d33ef1afcaf600cf238c10e
font_02_sfnt_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 11008 bytes
SHA-256: 0036a183dc250bde56073d4cb3f57aca2273d545b8d37a4e4aef2d8591effaf0

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