Malicious PDF — malware analysis report

Static analysis result for SHA-256 713a461cfb955a08…

MALICIOUS

PDF

84.4 KB Created: 2021-10-07 11:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 650b484511f007d49a2a47d649b75025 SHA-1: 4343f9c226b8939fdfb16b08ee631e4d44cbc38e SHA-256: 713a461cfb955a08d3e536c355320b639f22e4c96829302811718a523f01977c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catequesisnavarra.org/guiarte_userfiles/files/68443632175.pdf In PDF document text
    • http://nscenter.cn/upload/files/dezamo.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f58e155979---sokimuvolunilovo.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/punurinewositedare.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/zafepanil.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/19637547248.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/74751053653.pdfIn PDF document text
    • https://mimpidia.com/contents/files/lovabowupodenu.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/newilurirolafukupupaduza.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/zuwur.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/bejimugupujibefanibewit.pdfIn PDF document text
    • http://119pump.net/d/files/15261140936.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/89944641190.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/11897063383.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/89946138073.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/d824b0081d9106c0eaf5a1dfddeb6728/77946387589.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/zabikoxumadataremuferexa.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/56599721411.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/gcmplmtum7qfpuqd5i2l3r0mp1/82320088224.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615bed9742518---pevulaluwezodomuvilipa.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/sarekiwixami.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/55696751092.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/noxedesofolonoxol.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/zenevugatujekikapigef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=nausea+for+daysPDF 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_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 19052 bytes
SHA-256: 63b6894dfb72fd4776524e04073b120b7bde90ba2428a7e767fc25814bea4222
font_02_sfnt_off00012d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D45 10200 bytes
SHA-256: bd0f5b880f0752190efafd8d0d1d0d44001cfd83790175e25a12b1a9f59753a3