Malicious PDF — malware analysis report

Static analysis result for SHA-256 488bcb3f4d2dad88…

MALICIOUS

PDF

85.9 KB Created: 2021-07-10 07:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: be72cc80347b576aaf5b9614605f6808 SHA-1: 95c801711bad11413c5a53eba3621dca78f94dac SHA-256: 488bcb3f4d2dad88269f215927af26f4cd0fbb76bf154cf88112d641b394504b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous links pointing to potentially compromised CMS upload directories suggests a phishing or malware distribution scheme. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1642448e1---59261611165.pdf In PDF document text
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/40839115399.pdfIn PDF document text
    • http://mobilenmr.com/files/files/niniw.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/cd562f971532ef48bad39f9f274839c5/lifisabu.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/99051328135.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/267376183.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0415a1835---76814108744.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/rpkrq5j1136qlo8f8nhjbkn3h2/xefukoveguvanafedamulu.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/38879087621.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/257409a30f1d1eb82ead17cc19c33d8e/fusopepawososolavodawo.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede69bcc57---jogarokape.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7078731a---bogikanilidobibisurirazu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/020355282092.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/14a4c5b5d61eb8f21337d9e1707e0dcc/8597067955.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/mizelolavitu.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/51733c0ac5f6c521e468770fb9babfc8/vebebijunanalifolutafe.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fabbc4dc50---gajazerubu.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/rebiduladogufu.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/gofunavuvoligikem.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/kigelujejokevatal.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d710fb21167---sokixirivowar.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/05161708689.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/39200803298.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160819e26e0d47---dujatiponovexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=indian+polity+6th+edition+free+downloadPDF 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_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 17240 bytes
SHA-256: b60da2847798cbafcdd2bc1f3502f89b7dec93c8882c8adaf49125c63bf42e63
font_01_sfnt_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13187 10748 bytes
SHA-256: 785f2d73ee86b576bce62a2dd0eccde2ca36f19418331c073816985e9b1d06d8