Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc8dc46de9e44fa…

MALICIOUS

PDF

77.7 KB Created: 2021-09-23 20:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a85fb09f78638b436bd9f290d8845151 SHA-1: 6ee8dc5b71fa686219110057893e87e6b0b787e2 SHA-256: adc8dc46de9e44fa31b1bf2d2f8e58d82390288bf1802f35dd5c66db8a4d7abb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or compromised content management systems. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true malicious destination. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=apk+side+loader PDF link annotation
    • http://centre.annuaire-regional.com/ckfinder/userfiles/files/38966863491.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/23611195585.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/gejifafusodoneroxuvin.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/72288817501.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/11385166056.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d98c7249b70da33a532582411d67d244/57277966313.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405af8d637b---wonimepuroz.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/gekotutipijigosixusel.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/19915773856.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138f0bd7aae9---tunusifukupuxidarugu.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/67541413505.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/mamazigonameduripedupizet.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/64451202188.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/tojojotirum.pdfIn PDF document text
    • http://palami.by/images/file/zezopagudamatuzedifaxe.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/97i7si6dossege9jblmgmagbg0/ravatusagenoluxosunul.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210920_A17DEA202AA85E9B.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1d0448a4d1ff1d38206d6fd71b6d6dec/41482270094.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/32852418891.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/wikivedal.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/fbt5vn9h8s6rs7bmr9h87kmi6d/35620658127.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/rikoduzemamilat.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/77771534080.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_off0000cc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 17580 bytes
SHA-256: f0d0dc74ebab0dd2bbf3e71f9eb6518194f1a5f7dec43e289b4c31fee9b118ea
font_02_sfnt_off00011268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11268 10256 bytes
SHA-256: 3a4af4adde811b59b31873d276897a7319b4d5142843bb05e009262eeffedee0

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