Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a1de6338dee3a1…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 06:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f64db2710ca299c151ace9ddc58ee8fa SHA-1: 96b85c33ebe69dfc5301cb25ed1cda2ba3b719da SHA-256: 88a1de6338dee3a169fcc2a492d61062804df56416436ed2a5fbe8e38daecc35
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous URLs were extracted, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm designed to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://pistant.ru/uplcv?utm_term=how+do+you+close+tabs+on+your+phone PDF link annotation
    • https://telechips.com/ckfinder/userfiles/files/pusopoxamefenu.pdfIn PDF document text
    • https://inarsindbari.org/uploads/94195736657.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae43a19add---sajujom.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161331f8a3ee06---dosetasamuromonasadukeke.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/foxulewiwezuneg.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/34515700337.pdfIn PDF document text
    • https://majubesar.info/contents/files/60669037040.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/73670660999.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/88648835618.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/96416474054.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109091853103456.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/dosunofobaj.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/58201892857.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/sabitisotajito.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/lubula.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/94395868499.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/73fe6501527929a43ec25c1c8beaa5e9/90859674016.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/9196759539.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/62862944873.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/65405944520.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/liwobopizimok.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/teruzigimot.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/1817949390.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/54301513145.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/pinakalarag.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/piwokoxolesavi.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_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 17968 bytes
SHA-256: 61b8244ce739b7dbeadce7c89ba30843cc37e65304964df17d58b7d268a8dcdf
font_01_sfnt_off00010618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 10948 bytes
SHA-256: 2eb7fb8723d2ca857a5abb014d7098491733955429759f51c630c7b4fd186147

Open this report in the interactive analyzer, or submit your own file for analysis.