Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7090e3e4d2e9dba…

MALICIOUS

PDF

93.7 KB Created: 2021-10-27 19:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0f39e334e8ec47358ce1e11bfd9bdf57 SHA-1: 42045fea7477f5fed77b225998c3fc644f41c02f SHA-256: f7090e3e4d2e9dbaaab0cd6a45915ec6e89997a006e4bcdb398e88a9c9950707
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.santabriganti.org/admin/ckfinder/userfiles/files/lemuduxodenuripibesuf.pdf In PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615936ed49d2e---27205965136.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/1442450869.pdfIn PDF document text
    • http://sd-bada.yupucx.com/upFile/file///ITX202110162111547431.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/98667730238.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210902052423.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109302304443667.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/mazibazejodinubazajakev.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161783ad5a84c1---kafosunosekigesuvadoz.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/gozozosape.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/fufexugodatakomigol.pdfIn PDF document text
    • https://educhina.mn/editor/files/jibeju.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/18597507131.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/1911042623.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/92827097595.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/84790494020.pdfIn PDF document text
    • https://aspirans.com/files/file/goruwafumonumaxuzuzofuvu.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/wunawelajagimatopowevopu.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/fineg.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16151a11ccad7b---18544424792.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/tegazonoxopujonawegaz.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/34223266169.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615f39d542860---96361210656.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/u-9XGpgKpwY/uplcv?utm_term=medical+certificate+rtoPDF 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_off00010d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12592 10188 bytes
SHA-256: a6d771cb51f2f5f087578e56e9eaf60fef646e57a5dd2b7fc9e09b0832d2d6e2
font_02_sfnt_off00013c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C79 17108 bytes
SHA-256: 571859729da2388c3075e5c3a563a6e3b6a23f97624cc2724beedf5fb7fd3b73