Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e80aec8ab991098…

MALICIOUS

PDF

86.8 KB Created: 2021-06-26 08:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 22751fa05798262b41b758af9a670743 SHA-1: a7184cb7da520382b3006cde1ff073aa75188686 SHA-256: 8e80aec8ab9910986ac98f0559708c220a1a8368b3fd3adc593f055b20ef27b8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristic analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links are likely designed to lure users into clicking them, potentially leading to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca9d02522---64303270961.pdf In PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/rexop.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070385e2ae03---rewuzujekumovetaja.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/tikekikuxefotuwigesufazib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad91804cba---22935479636.pdfIn PDF document text
    • http://ciskmv.com/css/file/pefitane.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb6cac5cef---94978538107.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081784d9cc47---tajavibodizavodasowig.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/edghttel6ulngl6i4bdm7fa9vs/xinekoxedezesilapukaz.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/21975509839.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608752ae97de8---93095562116.pdfIn PDF document text
    • http://normel.org/files/upload/file/97440052944.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b413d2db57aa4221d5fb4a57eeef161d/famajuroleminigeli.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4bd091aa8---rajuwadufedini.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608337132752f---suruwunawuvolesuvosavibuj.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3d541cb56---38828556998.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a9ab65173b2f5f17efc5ea3c2c5d317f/62049476978.pdfIn PDF document text
    • http://beateromer.com/bilder/file/20962565625.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5049a3ce4---58400085752.pdfIn PDF document text
    • https://ecoretras.com/file/96250102793.pdfIn PDF document text
    • http://minicabii.com/survey/userfiles/files/77570898141.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/48400f1e61bea482ead452bb449c5dc9/nikikudobereguwisole.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/f9c0bc701e653014307303b8580dd5ea/nozudabizebexavumixuru.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/72046150265.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/95839412042.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/pujavarajemiwowivamuka.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/wipurutakebadorabomupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=1+and+2+kings+summary+pdfPDF 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_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 17260 bytes
SHA-256: 244f26c36c392d729e06146d43bea49ea3cf2ca04cb5a45eb9f38a65e82aceba
font_01_sfnt_off00011d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13524 10824 bytes
SHA-256: edafa09ed1633553a209fbf1d29d35cc1842c8c1ae6665dba370a6d460a13d9f