Malicious PDF — malware analysis report

Static analysis result for SHA-256 5520fc2fd0770b56…

MALICIOUS

PDF

135.6 KB Created: 2021-09-08 04:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc80f339f7ef231735ab15ff4faddba0 SHA-1: 71282a395430c549c184e6fc678f3b7b75fdfcae SHA-256: 5520fc2fd0770b567ad6f6f81eff1eb5283d1c17de7a9ae5f4a4f63d8d442bd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9727

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 http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc416157f23---suvize.pdf In PDF document text
    • http://computer-rudolstadt.de/upload/file/94496311840.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/20c0a6a54b949ef19fe731f54cc41be1/71032547103.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135152c2b81a---57281890232.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/buziwexeworefumuz.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/pomidagamepejowaf.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7218c0289d370ea221692c64cf9f47ff/61168574430.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/tebejasi.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/zusixipumatog.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d43efa26---28853149193.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/aa4a25949d148bc926ceb70d32e8930e/jekomaxifezuwejix.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/gefijorodoverag.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/34703110777.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/23012994169.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/61614910220.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8b51cb815---xojogop.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3084da3cf57e27d434500f93e89f95e8/94272163788.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/439ee51fcf6c535bea115aef26cbb58a/dofobedejileduguberawegi.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ci3qa55njsuadv1nhfccs2ulv2/55833056849.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210728/file/kosejola.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/vapoj.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/zemiziraz.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c69af51c44f---wopataso.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/31a8b39f8c519ee15e5242bf595ff402/ninotezejokisazut.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/82283653256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=buku+ajar+ulumul+quran+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001898e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1898E 10568 bytes
SHA-256: e16a95b067dbe1b986ffb1470fb4fd084c2d03a92a586002acd995493ce61452
font_01_sfnt_off0001a168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A168 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_02_sfnt_off0001b70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B70D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001cf1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF1F 25708 bytes
SHA-256: dbcc512046410b989cfdae9953f9eaa57990ba83a30354ff38120486c969cadc

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