Malicious PDF — malware analysis report

Static analysis result for SHA-256 1452b926faa63a79…

MALICIOUS

PDF

75.5 KB Created: 2021-09-20 10:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 33e8947ca449037963679577e1759fd9 SHA-1: 5b120363dfd9207d0a9bac455b29fe19b50748fa SHA-256: 1452b926faa63a79767e7dc65bc2988193c03c70fb4d61bbb7e7bb5ea1cca5c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term=pes+20+download+for+android' in one URL indicates a lure for software downloads. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://shinyoungvalve.com/userData/board/file/29699128600.pdf In PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136fa7d8610e---pigulapigosezobuf.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/burexetegudikokowubugo.pdfIn PDF document text
    • https://onlinendttraining.com/files/tokowebigasesusok.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/lofaxofafutojebexiti.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210910190400.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/86671173850.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/xikumekefumiwepo.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/5s59pra7c64hg7h2g8vii6ecdr/kedopatugekus.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/62175565975.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613483953a260---19631185349.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/xamigitepupagitiburomi.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/watelarovatu.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/1155650815.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/26457020992.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/67643045884.pdfIn PDF document text
    • https://capecoralliving.com/media/file/xebiwe.pdfIn PDF document text
    • https://theipbuzz.com/images/file/20918077675.pdfIn PDF document text
    • http://newshop.jp/archive/file/jasaxek.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631070248.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/17444868073.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/wajesazo.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/pafafujupenimivadej.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/pakosawebeliromudowifir.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/98109972578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pes+20+download+for+androidPDF 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_off0000c239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC239 17556 bytes
SHA-256: dc3ae9e7bc2c3b12a3a01812d3e4b875b6270a010a569f898900dc487ff9a6aa
font_01_sfnt_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 10580 bytes
SHA-256: ea69155c4f07dfa58a9849d7fde5b15dc3ce0a7bd93a65ccf1698054bd1cf5c0

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