Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3082aff7a9acfe3…

MALICIOUS

PDF

70.7 KB Created: 2021-09-15 09:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c9d13b96758d0188ce890fb6514095d6 SHA-1: 717842e10926f80dc67c4db3fef4e56c6eaa1ad0 SHA-256: c3082aff7a9acfe335f070b47c0bc7288139870f406958f43e7ceaae9d3f45e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, 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 directly extracted, the PDF structure and embedded URIs are indicative of an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dulichtantai.com/files/uploaded/files/vogezibag.pdf In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16131fc0ca9382---69016665993.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16141116d5356a---robedipujepuzujafigoguni.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/laboze.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/lasilobo.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/39631737127.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/muvibunat.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/lobokuwodonepibedala.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411bc8f2145---bipapilezojowinisakonomax.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/rixuwut.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/28842772915.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/70639725517.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/fogujeju.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/gituvawagare.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/jubaxuzonaduteza.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/legazabiwezis.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5d15ef586---jibejuvonabamarova.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132feddca2aa---50987483997.pdfIn PDF document text
    • https://sim2007.com/files/zumemufipavepab.pdfIn PDF document text
    • http://kite-surf.sk/files/ravabazebiratema.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/toxulilufosakakopokuf.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/43738764282.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/novosileneto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=obd2+source+codePDF 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_off0000b4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B4 16232 bytes
SHA-256: 1b42b3c8fd60ffc9b39074d21092b8937ab94a30bedb340cf31c65ca18bc901a
font_01_sfnt_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 10248 bytes
SHA-256: 66c18729cf2acb14939358185914b10a3a2c82d6780613bdd1a5a31bb2604728
font_02_sfnt_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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