Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e017b4a7b39ff4…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 23:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62a5d44bce1e507bbefe387af0fa85e5 SHA-1: 60cff17a57f85fa2422cc270bb97a1312f13d059 SHA-256: a4e017b4a7b39ff4e702669a10f7ab722f8ed7d40048fa5ce81273dd356c8f4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. Several URLs point to compromised WordPress sites, suggesting a tactic of using compromised infrastructure for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/8ee1102c68eea1c68e83b7f13b38c79c/famumexubuwak.pdf
    • https://surupaceanu.ro/ckfinder/userfiles/files/zuzudugipujadivasarumiv.pdf
    • http://turinhotelcompany.com/userfiles/files/85760159911.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64dade5503---pabokukigegutixumataza.pdf
    • http://jewelry-shopping-city.com/uploads/files/202109021433254168.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161184efc1d14f---devogewepagotil.pdf
    • https://rachelrom.com/rescontent/file/77583509786.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9jkjoqvrfcp86l918qdv3qmse1/tedizewosadaja.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/6acdabbdfa151d2bac09fed7fee4d28f/xuvizozitonifu.pdf
    • http://abwnickersonplaza.com/uploads/files/xurutuxemojezapodazow.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a460b031180---13824825443.pdf
    • http://www.nagsa.es/ckfinder/userfiles/files/wurinadanutugakike.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/4qc4sn00tiajmnrlmb4rlchvde/salom.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607609f133baf---79145138097.pdf
    • https://megatex.ua/images/uploads/file/pasorakamuvuvelebipub.pdf
    • http://ambulatorioveterinariocamali.com/userfiles/files/fulibele.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/37f1e5aff795166bc59238bc9539f613/77294254126.pdf
    • http://albino-pitti.com/pub_img/file/lurazidinezizexes.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/3deb73212d538ad133d045f2c42888a9/levoxowogokagavaxute.pdf
    • http://otvorene-srdce.sk/userfiles/file/86744279548.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/59347582493.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a5fdeaee1---nofuzufipufepokego.pdf
    • http://heryeryesil.com/resimlerfiles/bonopalixaw.pdf
    • http://gibisch.biz/files/files/vegij.pdf
    • https://rotitelor.com/contents//files/wulitago.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=manual+do+usuario+samsung+j7+neo
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/87782793829.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c38d.bin
d6828d59d7ed331aa055f7935632a8149503db190611f766c17584ac930c621a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC38D 18820 bytes
font_01_sfnt_off0000f4c5.bin
826839c38363e3182621106d1da7b36ac5379ce62b5924a15038868b4e2a271a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 10764 bytes
font_02_sfnt_off00010d40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 16792 bytes