Malicious PDF — malware analysis report

Static analysis result for SHA-256 8112b0d7ae736ea4…

MALICIOUS

PDF

87.6 KB Created: 2021-09-09 02:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b95a00dd84f087b03cad588c5f735c6b SHA-1: 1dc7d6c3c0d61792e9a3fb287fd3a63c8c5a109d SHA-256: 8112b0d7ae736ea49e2f1bf7daff8e4411bdee7f33c8b60c092336ecc04f6d35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=picsart+download+2020 PDF link annotation
    • https://creteotels.gr/FCKeditor/userimages/file/domokotegiberuzivovup.pdfIn PDF document text
    • http://starma.pl/files/file/3113283054.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/wijewefudaj.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/17533137758.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/27541162592.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe1073b58f---livum.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f3916ab15---60394367701.pdfIn PDF document text
    • https://sim2007.com/files/defudojiwa.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109040423133162.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/zukumus.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/jukipudakaw.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/48470397046.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/xeneximotekadoxufusata.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-9/20210909055929783664.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/74329143955.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/7606544334.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/bazedivibox.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/466e7fb91d525ad81fa49bb1abdf58a6/lafadolajuzitolij.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/79696687199.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/4d902a31e6f72c946161ed3cf017a4da/fetewiseninoles.pdfIn PDF document text
    • https://irantruck.ir/data/file/30292905100.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/ximuzexonabam.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/80839662268.pdfIn PDF document text
    • 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_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 10560 bytes
SHA-256: 1eb1188550fe22b2309ee92ebf3a8b8df525e0086a49675c07cbe1555681803d
font_01_sfnt_off0001093e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 18456 bytes
SHA-256: 7c5d89fd2f1b89ec6a63b1a1a52152f119b2fcb6421c827de539b41a0368b669