Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef470c5a1732833…

MALICIOUS

PDF

89.8 KB Created: 2021-07-20 20:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 186bb4e514d99a23e8d46954704f6951 SHA-1: 752d55987b530ac9d80978eb73d051e542584340 SHA-256: 7ef470c5a1732833783bfe190a9706dde08a296877f9ee9a3271f5117348945b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple external links and the detection signatures strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://micsys.in/userfiles/file/vivosijupi.pdf
    • http://familiehollander.nl/images/uploadedimages/file/powuveki.pdf
    • http://suseefinance.com/userfiles/file/guxuv.pdf
    • http://mygiftltd.com/userfiles/file/55336987193.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecfa6e534a---vilajadumewatomitelivat.pdf
    • https://nuttydog.hu/ckfinder/userfiles/files/faganufanexuzorizufotov.pdf
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/22283275058.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/mcnqr2r5rnu7ragd0hi8ouc830/vugogix.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc373826cd4---62375079539.pdf
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/lideza.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fd1d3a0c0---38133053759.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/ff9079edaef8372efd6e62b7d9edcd83/kamuwupid.pdf
    • https://motacademy.it/file/belafopebifidixenawenak.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/guwedewezukagorupobo.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/317e7cbcd6bac8b5747028f476f495b9/78888038947.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6a34293d0ad7ff6fb5470913ba6326ab/vowovorag.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5fc29433f---98000664269.pdf
    • http://turar-mussin.com/userfiles/File/gixuxuxiket.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089adc24727b---32559539014.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7c8eccac3---mefuwakadimaladozebufebuf.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/59678086795.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160892e7bd50b7---91498496953.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce88d8783c---kanimafenadesog.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712b7b0681b---jedojobomumelaka.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/7f4e12927734ac6268ac7fdaf002f50a/garozugoxujoseporufotix.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=convert+picture+to+text+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_off0000fca9.bin
f364c498bbb79f04cb1bfd44e6547e748d3f331005c987dec93e4d727b7027aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 10396 bytes
font_01_sfnt_off0001145d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 16792 bytes
font_02_sfnt_off00012c6f.bin
d5a8f722f0f3b1a93c1112f5890e2d980d5e909e27b9662f4ec4117b5b3bb527
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6F 17368 bytes