Malicious PDF — malware analysis report

Static analysis result for SHA-256 abce505a5c443b24…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 18:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a6c23a444b51d2457d2df738f7b4d98f SHA-1: 0020deb22e1e9dc94ae8ebda022ff394921c0e10 SHA-256: abce505a5c443b243002a6806b6e36885494c2559c8448883bd3b691d7a9e781
176 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The document contains a large number of embedded URLs, many of which point to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of a QR code lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://swaving-stalinrichting.nl/ckfinder/userfiles/files/foxijafigotiliwugipinoreg.pdf In PDF document text
    • http://texmet.pl/userimages/file/21666007660.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/60892400383.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/vozazaxud.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/12954107941.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///6283858269.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/69db480f493eda26a77c949039f74222/21765127597.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/17903017708.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/xiwofo.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/fafafukosemabegabil.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/rovunexiwutu.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/vevikabatopotolavomirome.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/piwuvawawilesasuxevunawij.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f711aa029---torapel.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/52897687690.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/zezalute.pdfIn PDF document text
    • http://jonme.net/ckupload/files/20152677557.pdfIn PDF document text
    • http://trevorhannant.com/5436651651.pdfIn PDF document text
    • http://ymmicro.com/files/files/1767861742.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/21884736953.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/65836d501670a848ac2e5edd6fe46c0d/49351301634.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/fisob.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324e0b14ea1---zesuxava.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/30635459785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=anime+tv+mod+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_off0000afad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAD 10380 bytes
SHA-256: 5fc99b3b402282295066994c6bf18ea8335223a04ad243607b46102af9ce6910
font_01_sfnt_off0000c72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 16176 bytes
SHA-256: 442b84c5d60b7d6238e166dc1928bc363623f89d802ea599dd2a14a3b27593e3