Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c426e1ed431a1e…

MALICIOUS

PDF

90.3 KB Created: 2021-08-13 15:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1d9a7f63c2020bd9dde762285f9fe120 SHA-1: 748fa7461891d1863c982467e04c8a1d4c96043a SHA-256: 72c426e1ed431a1e4b222240aad42de7a15f3c949a54e32a36903a2b9135f11f
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware distribution.

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://synerhu.ru/uplcv?utm_term=ejercicios+de+ecuaciones+exponenciales+y+logaritmicas+pdf+4+eso PDF link annotation
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/fcn7n1udckmfkpocec65tt343i/50447377350.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/nemodobaputozowemakaroza.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/riropujoxoluvesovoz.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/finuzuvufug.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4cdfb9464---84807287632.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/12133039371.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/12197510349.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/dumoxuxedafiwowoxezobur.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/vizizizewikuj.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/36336827156.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/digibe.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/6d58g3ghj0ma7hoggbr68l7gc2/ditubavubajizizovevigi.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/96528609187.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077913a27a81---jopewajisagu.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/wuzimabozajebofafeji.pdfIn PDF document text
    • http://one9five.com/userfiles/files/lorozawezubikul.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/7so7a8s9i5ln0slbblrunddshb/bevun.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ba38826d7---4255697233.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/5d9101026332fe3dfab69118acc87a33/sepurikapudorituruval.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/bajotumukozekibunuz.pdfIn PDF document text
    • http://baudoinfamily.com/clients/f/fc/fc66627f90e8a365851b026dcf169025/File/71155775395.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/42341087442.pdfIn PDF document text
    • http://bjjiffy.com/upload/10371659133.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d283d0658fa---59873483166.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/86730937464.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

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_off0000f581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF581 19020 bytes
SHA-256: 9f53967b9e26f5de90bd1ab226456b982161375fe24946ec28a5c0385e646d26
font_01_sfnt_off0001276c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276C 11468 bytes
SHA-256: a04479eda46fd12b58ca97e03e750104540be08cddcd0ef954bb44703ad56996
font_02_sfnt_off00014263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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