Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a51aa46bb2d7206…

MALICIOUS

PDF

77.4 KB Created: 2021-09-18 10:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7d08942eed35e76891bb3628e227962 SHA-1: cfe30591aa2b32341c29fe7c897a6015528df3dd SHA-256: 6a51aa46bb2d72063bdd285dc2aac0b64c2117a577c1ea8e18fffb72d52738d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://solar-makernavi.com/ckfinder/userfiles/files/kowofawexazasinodoxajavi.pdf In PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/70201042382.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/5762933067.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/bafepeduxabaridib.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135643176c54---kowegoganix.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/14379710058.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/fagam.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/25363621044.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/kuvavajupozajuworatimalo.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/sixemiwatanaduvabumagiwi.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/fadub.pdfIn PDF document text
    • http://pasted-radio.de/web/files/radevaxotezifodogudukil.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/63956028678.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/77559766906.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/62954480345.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ee7b8bf23a67ca0d71fe173ba8f2aea9/zipiremekidowa.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/rusonukaxutuboruzo.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/linakoviluduwupos.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/gifatip.pdfIn PDF document text
    • http://sinostandards.net/upload/files/pixid.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/68030900080.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/21230432585.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a777e87342c84d7b7cf7ed3b7638cd3b/nirigugudotemofirosanerim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=tom+and+jerry+ken+jeongPDF 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_off0000c896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 10488 bytes
SHA-256: 7e5444b77fc9ad5714bd78d6aff5adda3161f14102fe5292bb6f5877823e33de
font_02_sfnt_off0000f84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 18616 bytes
SHA-256: 2a25b1b306c9627ffb816b7185bd1dd2b8480c494bd02dbd7c590001e74473d8