Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fab15d8c9e21b6…

MALICIOUS

PDF

74.2 KB Created: 2021-09-27 00:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1278bf3374b193834412b23d06d69375 SHA-1: 56e7a9c8fdc83b37e3af3cf0c66009b6a3445ec3 SHA-256: 24fab15d8c9e21b604dc2e2f43b76fb7e5f6b207bb5b9dc9e3e9237a9b6fe60f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the document functions as a link farm, directing users to various external websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://terhautz.com/upload_files/files/78136736312.pdf In PDF document text
    • https://comfort8889.com/upload/files/nidipiwaritodadirosakaba.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/56981964203.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161346c5a8b542---27283237393.pdfIn PDF document text
    • https://egf.tw/test2/images/file/xuronekajurumo.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/36821286970.pdfIn PDF document text
    • http://saint-party.com/media/file/6074651285.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210918_231359.pdfPDF link annotation
    • http://classicalgardenfountains.com/uplds/file/54307073652.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/ff267d2a4c97500532e040a1e33b4a0d/26276638986.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/neluwizepufarobuxegugeko.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/49303198273.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/fejadidugumarakejaraw.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/larafitugexu.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/14390617003.pdfIn PDF document text
    • https://argumentua.com/i/file/82427561685.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/37838044609.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/499583f084a031600d739f22371d2d2b/74110079458.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/64884091131.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/majelelokol.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/67799629517.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/s11dbjv8u6mcei184rjah76587/mufowaxegus.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/76vl280463q8puk6kj5n78dac2/puvazajawomirovadopep.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/tulofewupiko.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/90340800362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=tvtap+latest+versionPDF 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_off0000ba3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24C 18812 bytes
SHA-256: 9c36e53809ececff452e553f04b8f31dd97f5002c73f4dd40986a164d7c6c0fb
font_02_sfnt_off00010287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 10276 bytes
SHA-256: 7eb27fe5b39ef54881e501d16156e827d0dab2d606a971c9dbccd207d804549a

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