Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd8d41b49e170da…

MALICIOUS

PDF

85.7 KB Created: 2021-07-05 01:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: afbc4734b81716159380ed3f86a9d1c7 SHA-1: 42043accf4a7d8e284787b7a7f914a29f37dc7c6 SHA-256: abd8d41b49e170da1060c450fb9cc83bad9a4ccce9cb21c2c4086873f8061169
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607923e9d0575---nowidalunidix.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16080f167ca34d---somoxalovorujoxaxoxefama.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/93385575297.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c43d5fd74ba---ropazisesunoveruzizo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8c8a0cf6---lafujawesujoxujodime.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/53930344012.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/rizotor.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/39096155174.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/70878755691.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/69470473150.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/tujivowunujiwofozesal.pdfIn PDF document text
    • http://webbuilders.com/files/file/89035098394.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210623021538.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/zenuwoxaber.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087a18bc39af---vijilav.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/ee340eeef2e8f74301317eab0ffcc592/vugoxilixugezi.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/junegejamasevifapugekaki.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7535941d03---kexaluluver.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d309fa6b8ff---72988028885.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5a475793e38c821e601b079efd05bcf4/6768974154.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/kopagizafotidigukubatozap.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/64r7cq7tl178jmb0tkdg4qfp32/mositadalinirewazototinav.pdfIn PDF document text
    • https://actorconseil.com/files/file/72845818506.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/kifoxijidijulibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=obsessive+personality+traitsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 17332 bytes
SHA-256: b4b20aa5a0b0cd10b6bffc197a25fa87b53bcfde6d9086e4cf55c54f1a9c3abf
font_01_sfnt_off0001195e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13175 10592 bytes
SHA-256: 23d48f18d69c6ef62813daa3364f49179a8864b3e5d765138fb16c5fd31b258b

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