Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bca4ce40c6afba4…

MALICIOUS

PDF

90.4 KB Created: 2021-08-10 20:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3fc4c656ca114d8ff7c8b1866f0ec7c SHA-1: 8512bd55b9151a748947c99a7bdc140fc88a53f5 SHA-256: 9bca4ce40c6afba46e707e3dadc18901d87d0f749e9a46e52bda5b0165746fab
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous unknown URLs, many hosted on compromised CMS platforms, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9054d8396---mevanixiz.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a12d40a225---debamojexumazidafuwiwaz.pdf
    • https://topupdana.com/contents//files/rinadowavimamenelibu.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160798f4dd8535---48418117790.pdf
    • http://chaitraglaze.com/uploads/pinejolajazugipazajuzu.pdf
    • http://asiadomainstore.com/userfiles/file/juruzidifidisu.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072a9534f343---liwewedijodibibewo.pdf
    • http://teplospectr.ru/images/files/xolewaravasiguwupowedusor.pdf
    • http://accapierre.it/userfiles/files/bimilurebaxisijotir.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/reboja.pdf
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/wilitogubim.pdf
    • http://potentialdesign.cn/userfiles/file/1628451417.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a9063eb56f40980bb334a73b938ec075/21850484769.pdf
    • http://geoass.eu/userfiles/files/17385001579.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/79b5555fcf75e2012731dc6236274d28/wusatuvuzom.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096689367079---gorekivelik.pdf
    • http://vom-ragnaroek.de/uploads/file/tosemudatiraferewazevi.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea616c5435---torib.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16081677c9f41d---sozudovazezagogipidakoxij.pdf
    • http://valaptop.com/ImagesVA/file/luxovesebiz.pdf
    • http://billsky.ee/files/file/mugakunawid.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d92b0a143e---lazumovat.pdf
    • https://x-software.cz/data/file/69371709865.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609bad5265f35---zafobogevuzipetuzal.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a9813bee0c2---pepewo.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7d976e278---sajetopidonetosekukujaf.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16084f9d2589b4---78996483824.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=game+zombie+avengers+mod+apk
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e3.bin
9078d9721bd5d0c1a1d1414fb71eefbdcea1e5ffb6fddaa41e51e0f4007515c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 17324 bytes
font_01_sfnt_off00011495.bin
b7093f785ec57c79b4947b7452c5da00f41eaa5e507d67f2e10c9019cc00852e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11495 10988 bytes
font_02_sfnt_off00012db8.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB8 16092 bytes
font_03_sfnt_off000142fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142FD 16792 bytes

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