Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44b695ba719cc00…

MALICIOUS

PDF

87.0 KB Created: 2021-06-28 19:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59d3b01344e9c25c28ebbf4cd220870e SHA-1: 6ed0b50ec2d1a5d14ece5db5b42bf48860710650 SHA-256: e44b695ba719cc007aa9dbd6dff3f512768764e98a1dd3754b3a166a62bf31f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals a link farm hosted on compromised WordPress sites, with multiple distinct hosts and a high number of PDF links. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious or phishing content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3528

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 http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf489748e8---3321727119.pdf
    • http://aucoindeshalles.fr/menu/file/zerotipifupujaterofo.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a26832d2d5f---zojigalajidofisupejavamaz.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b167452fa29---77336684944.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b197f1ab30a46034d5e300ed28633be4/vuketilunewabigatax.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/1e29ebb353161362912b2b65ac44ba9e/birakevunozunuxogo.pdf
    • http://tourister.kr/userfiles/file/luzubepufav.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869e0172e95---finez.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160866fe851f20---61477497488.pdf
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65663893042.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/qlej6uu2451058vsa7590qb165/kapevogigijapa.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/bolujukofirofamojumamaz.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4d74pl3i5o4jjl21tajtji8rlf/fumuzefiranegepusetinose.pdf
    • http://knuhpharm.kr/userfiles/file/20210616141248.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f594a66387---92411976018.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe47a6s9aknh38p3srltpk1tdm/dugiwilej.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/c0drvaq8sel38pd4gf28t9mc9a/xexukapibujafis.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/sk5iisv9gr9i4b45c7c3o3qrj4/luwimekixekag.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ba00e57ce---23843668804.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160796160aedaa---41591637370.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5c14be7f6---bokozomeg.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/kiwixo.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/213894cb6b330564d2f802a792e7019e/lenulajeb.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+are+the+four+steps+of+mitosis+in+order
    • 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_off0000faa0.bin
1f285631d46b2a548690ffd23d203f88985908e66e58a4ef040c7c9472d87660
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 10808 bytes
font_01_sfnt_off0001135e.bin
1bf75a64da165e1d67cc701f4cc2acda13037827ec0bd1493db193bcf02c6942
pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 16732 bytes
font_02_sfnt_off00013eda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDA 16792 bytes