Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4a2017e7cdc4cf…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 03:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a5ac6a16d70067cab856be824372def6 SHA-1: 6178362860278a8eaff93ca72823fc124bf8eb5a SHA-256: 4c4a2017e7cdc4cf110645aa062ab718703d2b671b262386892f96ac0140f5e1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://dusunceokulu.net/resimler/files/11682099069.pdf In PDF document text
    • http://kaupa.cz/userfiles/file/kafaxavage.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/82902538032.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/2109120526058212344s6m2c.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/62296917354.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/46793329652.pdfIn PDF document text
    • http://hongdacable.com/d/files/lomanabenemakuz.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8659ddae35d1cc7379d6e97615824ab7/famavipetivatufozakamiv.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d5b16e985fb255bb7d1826d4a5499619/wedibudijipozimenezed.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/43434713121.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/31272484762.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/remonowutuziwe.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/peporumuwewejufoxoket.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/selibagerutosupakipasijav.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/pewolitemo.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/48593992735.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/gufowuvagawowim.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/61970653822.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/lelubijodimigadi.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/ad667662cc19f05fd78eccc4f0f09a3a/vofonesisutuguzimigitima.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/fepewife.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/8840368970.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134951e715af---2698469273.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/36015218811.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/70195381060.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/27737881191.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/mujubelix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+busy+coder%27s+guide+to+android+developmentPDF 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_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 18040 bytes
SHA-256: 54c23f2d319300a25ea9b8b35eaf4b7e1bc109bde2be0ef91ca723543aba2529
font_01_sfnt_off00011070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12887 11376 bytes
SHA-256: 54f2e1654889f458b9cc77cbc5302f201c9eba0b37a7fc64a16914256bf28f74

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