Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2339136ea861176…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 07:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e82c87db5a17715f42c1a10bd8124af7 SHA-1: fc483340ae13f9c1a8ca1efb3ae03652b1275ad4 SHA-256: f2339136ea861176a9af9f5990d9afd4cafbb2abfb14798078c642bb12ad97a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laptoptranganh.com/data/dulieu/files/77278135746.pdf In PDF document text
    • https://tivicom.vn/upload/files/pubuzolo.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/h210rr9pa83mk1l9ol13v7rge5/93866888464.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/5018667953.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/55105582152.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f40897d788dc6f9cb579a1892120ad53/27280647231.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/6970642121.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/muzudebisimirenol.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/baxun.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/83312594505.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40b7c55bd3---gukija.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/sowunalenaxotog.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/78352643621.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3a0bc6cb6---nuxaruletilabajo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079d6b055d95---37276400171.pdfIn PDF document text
    • http://sswjeans.com/files/46314538005.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/jb8km7nudp72dvri3knblbg6ib/rajiwusevavaduxiresaketot.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/43246541573.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210808065630.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/tedisopukikixurazugo.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/damadufofilizovulat.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/45232569663.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072c9384880d---72536595003.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/fenakusujomobure.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/079fbd9040f5e741dfdff1501fa90a83/52738992248.pdfIn PDF document text
    • http://sam-global.info/files/file/busarer.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612654057c99e---tetaba.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/lemotibubog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mickey%27s+not+so+scary+halloween+party+map+2019+pdfPDF 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_off0000ba87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 11668 bytes
SHA-256: 9b1811d69995405c2e3f3793671d8c6223daab746293fc2932ae92603fcd8f6f
font_02_sfnt_off0000ee6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6D 16160 bytes
SHA-256: 8224bd590536c0eb67d89a444c4ead5d39e9d9acdd1c9cc9e2f8bf6d37f5986d

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