Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f556e2f03ba513…

MALICIOUS

PDF

85.0 KB Created: 2021-06-30 07:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 819063c803cf350763917746ca809cde SHA-1: d39eca9064ecb1515e1e2f990ba57ebc4870a260 SHA-256: 89f556e2f03ba5139f8b5fe276662d20282e88dd3255ce4fb01e5cc1fcaff1c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links appear to form a link farm, likely designed to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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 http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160742d58a23c3---28634927819.pdf In PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/a8fgs1spm4pucrnv9umrmn1sus/17167382052.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/9102b12a9105c87cedf3cf39b3e11043/70773138266.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/163da1a89a0b3350e35f10def834b0d8/47527912442.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/d17dea311f922805992cd197518ab461/42884358544.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a8b20394f---19514240042.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c59689209ad---nepukopi.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/67194191322.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608195ed7e5ac---58176188320.pdfIn PDF document text
    • https://goodline.by/userfiles/file/80394315729.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cafcbea86---60166239990.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/16460898575.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-2/20210502212603103597.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/4711723914.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/wenimemaromi.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/10845003219.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/71721335094.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2c796a64bcd7cfcd98500bbdaa503c81/tizelixedinekuzuxataj.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a06bc613b60---pofukafekopipimiwosibapi.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/nodebifisabap.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4512b9a4c9---21522417559.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607238cd3ef0a---lowenabumumewevapasobeno.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/ab0139a48419b57371a056f039b28538/63973981969.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/06ac27f6d1461762626100bbcc115e97/4048677175.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e5361b9e2---kazin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=financial+management+meaningPDF 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_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 17112 bytes
SHA-256: 96b820ffe501400075b27a722ed83d1e232f255090f957966fe1f7540ae0110a
font_01_sfnt_off000117c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDE 10164 bytes
SHA-256: e15fb8756283f117fed77a3b0c75cf596edebd4cce7a3d5ee8096c006a1bbdf1

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