Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19877221ee58ffb…

MALICIOUS

PDF

94.6 KB Created: 2021-07-02 15:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 55cde73f2ecaa5645755b408ab17fada SHA-1: 8432026201f6e293b0a51cfece4053ce60593cdc SHA-256: c19877221ee58ffba9b36b56ba6d91f9845cb01beaa229c31f396da25298d30e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/c799720135912d24a18038f5c0193623/morilezufisodirexo.pdf In PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/dazefoxuduxazalesekatapez.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/4a619091d7486e6b3f54536e10bf6ec9/legudexelakagesikipaxi.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd5f4c6d8f---xotumubifinazumaliligibeb.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/dodap.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ckbmk6b6v83g49bedltqfcvs9f/14593627260.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/a5f7e91af0e0b2ac3231977511bd624b/burodetok.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071635c25b9f---nasuligapetugisizuzor.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6a61836b---jexufa.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/xofokerapakoki.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9f98614be---67848617678.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/v4bb93gljoqtnr2udmj99r4b1s/73469672985.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/c4257aaaa7e351228d4dee256644635c/juloru.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/puwuradurekati.pdfIn PDF document text
    • http://iltorg.ru/upload/file/71320875961.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/acdbed4a11fd72d96eb35c156abe0fea/18033732386.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/kujedanosekemoliror.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/bineguveboganalowubenapem.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c973e0cc92---gogonavuwogibezenonisu.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/tidalifejegetuxigep.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/kafegakanabawiru.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/kogogafuvedawoga.pdfIn PDF document text
    • https://vieclamkythuat123.com/upload/files/24751016002.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/26177983508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=possible+hazards+in+the+classroom+and+corridorsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 16604 bytes
SHA-256: 3b854f6ec415deb1e3fc7a7deb7c20e5011e5f83c92cf39fc6d9f521cef1bc8c
font_01_sfnt_off00013bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D9 10836 bytes
SHA-256: a1fbeb7d6c28a52ad7c08e14cdacc6a40200bcfe1221a25b1f2a47adfde3be51