Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b13614d0b051297…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 05:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 896c6a94a7f5fb4d3f4f9a9d29510d37 SHA-1: 99f50d6bcf7f8d887fb4e015127e235859ac37f5 SHA-256: 1b13614d0b05129770292bfe37c165234f9f0bfab9f62a53eab0c04ddf9899b5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URLs were found, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body was unreadable, but the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://krassimirtaskov.com/userfiles/files/lakidi.pdf In PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/migegajanekeso.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/66480104051.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/19928243475.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/27194571320.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613058ee7f19a---jizeviritatenoguretiwozu.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/kajosawenowaxegaza.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/82315015747.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///508472572.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/77217123470.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/96753371447.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/sogewikufevegezaz.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f469b52fb---19587817420.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/bdf849a0f4d95b88bfaa5b47b3dbf1c2/gumofotufef.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/38151553185.pdfIn PDF document text
    • https://phnews.ro/files/file/95289131875.pdfIn PDF document text
    • http://sial.pl/galeria/file/10059928346.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/kelawupepezoz.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613453e24fc94---97955550836.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/menanagibezipevevubibibid.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/32089464265.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/zawisafowivugut.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/remujajaxegufok.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/24577344280.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/44298305732.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/47425108526.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/felija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=daily+expense+manager+pro+apkPDF 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_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 10804 bytes
SHA-256: 1f3abcf5f244a17d603c924df562386cf3000b5ed6a3d84052385cd4f174e4ac
font_02_sfnt_off000109ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 17952 bytes
SHA-256: 50996bbeced46231936aa0d29c7b04497ce387297f905f1ef09aae1b408ac0c9

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