Malicious PDF — malware analysis report

Static analysis result for SHA-256 53607f7bc766c66b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 14:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c078ee050ea0ee92302f080b79250f38 SHA-1: 2ec7b5fe0ef5806648b74546e9767997a75d4fb9 SHA-256: 53607f7bc766c66b6d715696fb124d784edb194903f510047298d0a170f0011e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of multiple external URIs and link farms suggests a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=%E1%BB%A9ng+d%E1%BB%A5ng+g%C3%B5+m%C3%A0n+h%C3%ACnh+m%E1%BB%9F+kh%C3%B3a+cho+android PDF link annotation
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/15dc381313d2a2141c591f778f6a65af/puvavuvotavopesimu.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091402023573499.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/snn2bkhj92thd3g3c12in81fv4/wibamoxemufafuveke.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/nudegexufuvuvo.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/tapidejobagevaf.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/22703210190.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/movedepalamojuvuj.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/tunilizofowos.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/5pu1e7tibdocij8o2e3bg4640s/54263371742.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/6759788692.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/3834929804.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/43547870125.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138b864c537c---zilomizujiwiwepizijopa.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/lazavuxodirudijidi.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab078a998---lobidijepoladogedipat.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/53864485638.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/xetavinamewakajavojerid.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/10499564515.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/34595311082.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/gumutoxifixuxopegozesasuv.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/lefivi.pdfIn PDF document text
    • https://olterus.org/contents/files/13658037472.pdfIn PDF document text
    • http://vce34.ru/attachments/file/41947793217.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/bce1a73e6d7fd07594b437cf4196a20c/tuvakunevepiriketi.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/37156302950.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_off0000d166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 11596 bytes
SHA-256: b9b035bf32a60749b2471e971e2e26d1ccbbfd385f521862475c426a6b34c345
font_02_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 27892 bytes
SHA-256: f05daafcc5cc281e2a4921dea1e927492d1f4706ed289a92fbd15278dab3dd90