Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa3c040b24b4e26…

MALICIOUS

PDF

71.0 KB Created: 2021-09-08 21:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50a914092dd9e42cbc66c2617f71b145 SHA-1: b4cbe822692d2df6414b11c1d4ddff2335b878d8 SHA-256: 4aa3c040b24b4e267bbe6a2543ee438be2b880a124159595e331fad3bfb96d95
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a click-outward action and containing numerous external links. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest the document is intended to redirect users to potentially malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 71 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://inwebjor.ru/uplcv?utm_term=ben+10+wrath+of+psychobos+game+download PDF link annotation
    • http://avtrak.ru/ckfinder/userfiles/files/lukafefifulubun.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/98373320169.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/rifiwegebigow.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/70423022599.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613695dc20daf---gosudadapefokulisugulafo.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/48608697361.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/95710924739.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/kuruzugujoduxibuko.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/7129340514.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/texezizibojomamepavijepu.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/radivokelowor.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a84a0581a---77360816690.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10985319875.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/pimexekodi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131a6d10bd20---25296821162.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/38915929991.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/dc35b5426298c47a78222b577f5ea822/suzuxuvonoborafukexibed.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/69366296285.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135d8bec6c89---49640930100.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-4/20210904213153755064.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/7910915430.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/jatidawijivokemora.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/fipifosogaroguda.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210905_051352.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330ee4c50ee---wugaligofupusegivewe.pdfIn PDF document text
    • http://vaithun.net/upload/files/nomopizadesotufasiw.pdfIn PDF document text
    • 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_off0000b712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB712 11540 bytes
SHA-256: aa68160568637e4ded2224e03f550ed7834264f9ce3990c8afa2fcb17ecb84e4
font_01_sfnt_off0000d1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 14404 bytes
SHA-256: 3d51fffcaca197a688582f41bc30200de850f13fdf0dc6b0d9d8e7cee554cca6
font_02_sfnt_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1