Malicious PDF — malware analysis report

Static analysis result for SHA-256 4943da85de31e758…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 22:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 95f2462f95a6ef7deb460328285d290c SHA-1: cc9ab4d1cafcb9a9bd7dacb1e5891aaaff691afd SHA-256: 4943da85de31e758faeba9f3090e9f33a6dfd93ec2fdb89f3e2da36531067858
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/29872007289.pdf In PDF document text
    • http://cestovni-postylka.eu/userfiles/file/81394990454.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/34342200785.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/pinodidulowosujukivesa.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/m7mgkdelf9ouh37fouh13o0l8g/35778201489.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/kanosapugokow.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/punuxarisoka.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/96204394738.pdfIn PDF document text
    • https://ccskin.com/geektic/files/15858689540.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/82481176724.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b59d6b1685---17646185235.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/rufonusigafiz.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/fegunazuruxuxomeme.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/kezugekewo.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c1f0d1ccb---17425407860.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/risivejurojodaguze.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142239133d71---31752576900.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/sixosipoligikuje.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3cf6380b92822177598c90135a12a865/zaxow.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/73543993729.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/47999781957.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/boruruvo.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6dbb22afb4752c4f39ec02a72dac0969/pogoxogipufezibejod.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lepabewakipoz.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/23958090868.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/nefuganerepusawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=whistle+to+find+phone+apk+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_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 17356 bytes
SHA-256: 880b416f627ce87e7645347e60c43bf3450cd52cc2c29d67f7092453b5209de5
font_01_sfnt_off000101cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 10664 bytes
SHA-256: a5dd2cd3c50356e34c0b7831a0ca08f722e6d479d4b688fd53e0017f51469b78
font_02_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1