Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa56ef823ef55767…

MALICIOUS

PDF

83.2 KB Created: 2021-07-01 20:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ce5225a795db665f471edf417e3b7c7 SHA-1: 1fdf8511fd039c9b13599f0cd4074b3f23deee33 SHA-256: aa56ef823ef5576765dc60bb391904df125089aee71a039a575fdf55b824d791
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting. These links are likely intended to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c66f48503---likexesorujezugipa.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb9af4999c---41337887507.pdf
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/69759487043.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5d0d0e4f---bukabovaw.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42ce02ac37---5249727101.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/46409246509.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31ca6dbbfb---mubikapapotonunipato.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/5b4oss50umfjmv9d8tpj9f48gh/76658984366.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceb2ec8ee7---diboxoju.pdf
    • https://anctools.com/ckfinder/userfiles/files/gitezovudetobu.pdf
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/61910113531.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608965535166c---nagaxadipifegan.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d47c2aa8a0f---85782349910.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e671f9dc73---bumiguvejibowidir.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d194919062e---94609975269.pdf
    • https://takipcisec.com/calisma2/files/uploads/vafuf.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29365d8805---getazilujeretekevemomip.pdf
    • http://sungwoneng.com/upfile_editor/2021/files/50249775632.pdf
    • http://kco.su/userfiles/file/tobafimuwotidazolevaba.pdf
    • http://bong-dem-long.org/upload/editor/files/pivetotozuvoliveku.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce3b834f75---wevul.pdf
    • http://ks4073.com/file_media/file_image/file/581974549.pdf
    • https://betalinktech.com/blmedia/file/kagujekawazurababijite.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16076029125bbb---jopesoxanufonijoguku.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=age+of+empires+3+complete+collection+download+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d408.bin
c9aebb9e6eb13cdf3ebb7c845807905ba23ba749b3b070f8faff45cc1c886e0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD408 21688 bytes
font_01_sfnt_off00010a97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 16792 bytes
font_02_sfnt_off000122ae.bin
0ae3b900b4d2683a5d67c6a17974620f2bf48df632dd38d4965a8b08ebfd71d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x122AE 11204 bytes