Malicious PDF — malware analysis report

Static analysis result for SHA-256 841719db54bddb3a…

MALICIOUS

PDF

72.1 KB Created: 2021-07-27 11:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2ddeac955259ae7ee11630a0300e57f SHA-1: 77b9df6e87b629b4b839af933ec9f6f5acac0bee SHA-256: 841719db54bddb3a477d55ced6d6876874de249870ad221b44af955de22f89f6
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to compromised CMS upload directories. The ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly suggests a phishing or trojan distribution intent. The file's structure as a link farm on disposable hosting further supports its use in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2573

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b770391b90---74466502955.pdf In PDF document text
    • http://almar-bus.pl/userfiles/file/78388938945.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f5cb37d1f---jawuxaligegubalidox.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///82391372480.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/51447463822.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/b2v6ek5eq6801nb2guo09ddkv7/jegosiwivixogetaxik.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1a1d7c062---79945508052.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a524d7e0677---rapoziwaf.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/titewugipabir.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/xaper.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/rusinewipuzibevukawazom.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/52d36fa0bd66c45654eb5dc21f9cea3b/lutumamekeme.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/038c17fd8b6b1a5475bed2d77eeeb951/22357721194.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7b4295e53c70dd1f9c126ae7cbd402cd/14697766697.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd268b0a8de---16636736318.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7522659949---faligoxexaxedanisav.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/biegtsojmbnvm3tkg6dhbqm8bj/kitowajurizilewipu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f82b7e43f---buxovewibipokivumof.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/98618752881.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/39edd9acaf410092e2e2d98578940858/2597432118.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/wotinegonepokofavukeni.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/orpkpbvgsc2mrgshbqmaepij05/lajewosufepisaxidulax.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160971209d0255---58764940936.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9e494008e---pofudikilik.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb28c213dc---38729226606.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b528a3b86e---xuzogikuruzebutun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=graduated+cylinder+worksheet+answer+keyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 10896 bytes
SHA-256: 2efc8557f96e0e40a3ef0a00fb1e5a4b05f792de40fa261e90daf953c0eb08e7

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