Malicious PDF — malware analysis report

Static analysis result for SHA-256 976d7659cc2610f5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-23 20:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cce88a7ab8db82984dce84e48d44e72a SHA-1: b700ab99ec787e364c0750e9af3bed761b948c1d SHA-256: 976d7659cc2610f529558d423d34d34059b809a243c6825ddb0dc0ee9eda8d95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8376e7943d30fc4f687e70ee50ca32ef/gigijepifaresawofaxafovo.pdf In PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/fbca07e34b2fb97f38c8f17d1104a862/27022989398.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613804213533c---jasozilitewanasilokur.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/domunatibifijedeponujofiv.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/95129285289.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/dexubojuwuzo.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/58091771084.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/94539442183.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/52110432567.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/womiwarulazofimawolege.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/ludofevejukafalik.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/romajorudugefalijib.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/97319052388.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/kevefememipovo.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/43426900557.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/dufusumasegizititoke.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/41075742108.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/7056783315.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/10031340109.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/natf77mq4oe65ivdb6pfmscaf7/68822439521.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/23221308657.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/kabid.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/11326464421.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/86101719246.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210921073022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+go+recovery+mode+in+macPDF 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_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 10756 bytes
SHA-256: cbc16ce63d8f49eab95cf6c34037f80a80dfe5d79beae36b4c40195864fe60f3
font_01_sfnt_off0000f269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 17332 bytes
SHA-256: 311220061f8ffe8a4a044686a45d54ea58c23b888d2b13e7c5dd9ef19390bd39

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