Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc55fbaec4bf232…

MALICIOUS

PDF

87.2 KB Created: 2021-07-03 05:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 652e03e20098882035b6f74c0754bed1 SHA-1: ee01b1c0a2bdb198e857d0cd03610325a06011d4 SHA-256: 8dc55fbaec4bf2327d38f2199795e0bfae0959d443ac0073f048497c0ea94619
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. While no scripts were directly extracted, the nature of the link farm and the presence of external URIs suggest a workflow designed to download and execute additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cu-hinothai.com/ckfinder/userfiles/files/viketijefusizikife.pdf In PDF document text
    • http://2ds-creations.fr/userfiles/file/patukisabugaguzunoj.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609728377649a---67810587523.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c7137a628---sigitewi.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/68253193961.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/82715372684.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/om248tp4bnq40t2sdkusoho7hs/buvabizalimafase.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/5blj1j5ehtgge8587omur0n187/dobetigulapinanerof.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/85ac34e480d155ece78a84f9d89a2b9d/fadaturuvafipamivo.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608255d1acbb2---3250726908.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc87c220c8---kiduvegexovivupe.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/tifugadovu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1dbfa7129---pimagolax.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/zonizuxuzozopadipi.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/86c7f3d48328e8d0e29213dfd1d1e007/jesolab.pdfIn PDF document text
    • http://allycatering.com/userfiles/93491251904.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6005c416c9---giloxi.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/0648o8v4spt4d4hc5c1e7nfktn/36976641453.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607953506db1a---95885871360.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/mimomokegokidegulebewap.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdeb7e07130---54406900366.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-9/20210509042809957986.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/15301848459.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16094c298d7b92---lalowovuxilapojunegurevas.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/09355dba1bc81c8e451dc2874d994e3a/sefuzagoporojikasidibopop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mission+impossible+4+dual+audioPDF 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_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 10668 bytes
SHA-256: eb489923b27f783ad6288be86e237abfb74e187cc323b119c70def6ff448d1c2
font_01_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 17604 bytes
SHA-256: 8a27fc536c456ce7e8981c32b1103a30ae696922b320912e7c998944baa5670d

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