Malicious PDF — malware analysis report

Static analysis result for SHA-256 849673baf2f0c637…

MALICIOUS

PDF

106.8 KB Created: 2021-07-23 01:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6dab853d5a9106cc57585fc74f3ce129 SHA-1: 8d846f08aaa28064de489347cc04021f611a131c SHA-256: 849673baf2f0c637aaa2088cdd915b3b531caf82083333cbec344d9a5af8db3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://easypayindia.in/userfiles/file/2943392127.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b844e159415---zaresipisupesujozo.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/30455365897.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/o6uul85jvh301fd87e3e3eucd3/lokalupinur.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/13447360644.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/78801556167.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/21328064326.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/93283729680.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/69839808569.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/75007352890.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/wusudelokajavozedel.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/57121090187.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/384a8de0088f0895a407ddb9b10f17bd/ruwunem.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/ruxetutudisimidivi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c3876503e---noviwizizewotunarun.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/c30d6b1f5bd19c21446705e03bf31c3d/99240238659.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094aec95835c---zoranod.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075df84d922c---kefesofaduxe.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2a4d8b9lfe5a0jn0jakfur6lg6/29720865012.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d5674f1f130---69089013339.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edffe179df9---dunesavi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16091676cbf09f---4770655429.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7vv3u50itq04nfk7m1coiaanj6/zofimesuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=words+that+start+with+i+to+describe+springPDF 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_off00013b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15385 10968 bytes
SHA-256: aadc692d03419dd30e5bbef50137cee5a4335b80c4c317edf0257d042ae51c21
font_02_sfnt_off00016c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C8A 18352 bytes
SHA-256: 296eb6b42ec8abf7785acb21fcfe2b3423762654fdf26023d307540c4c269b73

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