Malicious PDF — malware analysis report

Static analysis result for SHA-256 79200f7f35b12f10…

MALICIOUS

PDF

86.2 KB Created: 2021-09-14 00:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5b5caca8a1e19e728e513505814d37b SHA-1: d4f80f06aa354d2b5c94597849d7d92fbaa07e32 SHA-256: 79200f7f35b12f10451c32d19ec5e8dec2b5f2c03c8ff5d4366c3fdd32df52ee
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://austral-immo.com/userfiles/files/75962276959.pdf In PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613955bf4bb8e---fatibuxi.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/o0drr0hjkg5vhq7jvq70kufipb/jokanatinob.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/52582804857.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/kuwaruxugetubomowosobujen.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/pikedutaduzotiberava.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/10643103082.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/womufebunugob.pdfIn PDF document text
    • https://wittnebel.dk/file/6862431788.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a927e25526---96102774610.pdfIn PDF document text
    • http://palami.by/images/file/30698380847.pdfIn PDF document text
    • http://kag.fr/userfiles/file/44850310791.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210904090217218695hfbmbab3fryx.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/34564710393.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/zobigaxadufiwaxud.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/rezasivedo.pdfIn PDF document text
    • http://vit-physio.de/file/97629731868.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3465365440.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371292a66d8---wewidopegaxexi.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/38732370094.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/laxunefozekaxonalilaz.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/rokalanamijusu.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/74939529669.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/24523916464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=retract+battle+royale+apk+obbPDF 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_off0000e092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 10396 bytes
SHA-256: 64959860c3ba7bdd082be6e63cf01d45cc2a8f973984723438bc7b9b63907032
font_02_sfnt_off0001102b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102B 22464 bytes
SHA-256: 0abffd8fc4cabfde38af4e1ead5cb5993b930fcd34bc687ba1beac47c55a5936