Malicious PDF — malware analysis report

Static analysis result for SHA-256 88aa5c17333f8ea3…

MALICIOUS

PDF

79.3 KB Created: 2021-09-01 15:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b97be30b9cc66bb23a844bd865cbd497 SHA-1: 624e486716cbbb3d186420cda4572ac42a87bf48 SHA-256: 88aa5c17333f8ea3c3279b95eb64da36cbfdffd8e927f1d7913bdb23b260e8e9
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to potentially compromised CMS uploads or disposable hosting. These links likely serve to redirect users to malicious content or phishing sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://1544-7419.net/upload/fckeditor/file/dijegoze.pdf In PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/sofepatisexerukevarutok.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/kufazakizakobat.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161010dbbcfb24---wuroxekilixuxufus.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c1d9198a643d9724e8ab067e296ceee8/lamegegurujazi.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210627174618.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/12687092582.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/508eca532bc39f2f345fff3c85c18881/76620405238.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c7fa5040---kojexexofixefojaduzikopu.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/55772102777.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/41296298797.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eba610baf---50362394162.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/06c21c28d829a07a9bee3b5e64a3822c/35758173679.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/qcp03usr1l4jurhqs11hvv8uhj/17802459461.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/tibuvadoruturitezojefar.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/0df54968e84300ce73fd98041ef51b67/80600103792.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160807a18a03f9---ganelototak.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/8e80b9c0378402c8b60992de6b85d94e/rusorekaberowagit.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/24990004808.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c337b0f87---46059269646.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/nokebisuwizafugesav.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33e159e24e---magupadijizubido.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/93840172173.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/68749596914.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b427891e296---31724448204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=integration+of+technology+in+teaching+and+learning+processPDF 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_off0000d011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD011 17820 bytes
SHA-256: 84ac5607518bf6e0a026d547f0ca6168ce22c36ff8589700aa070e30ac8e8c96
font_01_sfnt_off0000fdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11616 10964 bytes
SHA-256: 75364abc5338a465021e8efa72f9202b84acd966a7278ff25c89f7d3af57b693

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