Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f0b341213760ba…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 15:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5a4e112f17ac3cba094bfa8a0b65c74 SHA-1: 883e7ce5747e3a63173677f21ba4089c13b2924b SHA-256: 37f0b341213760ba44b2b5afa813257dd052fd5ab5eb8ac2b53f34bdcae34a83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple external PDF files hosted on various domains, some of which are identified as compromised CMS uploads. This suggests the document is designed to lure users into clicking links that likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://queure.ru/uplcv?utm_term=how+to+use+keyboard+and+mouse+on+android+games PDF link annotation
    • https://hohsingfiber.com/ufiles/files/65367611588.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091104460938.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/7acc3b02c74a5bb6e66e5afb7f4ca0f9/43919511502.pdfIn PDF document text
    • http://weshare.vn/attachment/files/95438940360.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139211d77fec---37507736836.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/94175353412.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/ladusarumuz.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/40914445557.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/35540829560.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/89333194126.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/89907941171.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614579d638723---62287930920.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/79033903847.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/58475793266.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142693d1d5d5---14597189164.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/zumevaxejototifenus.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/gimizupozuvomap.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe55953ad---xatatevopomovolifarelajo.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/sewolixukovukuxaxowenoj.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/3760633487.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///45341430931.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1614666c137931---gogojewipe.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/bunerufoxepuwexowezavibo.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/kituvo.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210901210651.pdfIn PDF document text
    • 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_off0000cf56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 11068 bytes
SHA-256: 8d0453368629686cf922b594a45e7b2843ef4fca34c75111fabd1963d6f63a5b
font_02_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 17336 bytes
SHA-256: fa3bece22290aed1dca447ff02fc6db6467dfa7328a7c64545a2a83728cb6b71

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