Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d0f6c28e2d0550…

MALICIOUS

PDF

304.1 KB Created: 2021-06-27 22:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fb3b80906783a6460f95a101d115663c SHA-1: 1f584f179d4ebfc4708d8eb43ca5d333fcff102e SHA-256: b1d0f6c28e2d05502e96abc1e9e89c2eb8333de8b2022a07d91006ba428ac51b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a phishing lure, specifically using a 'link farm' pointing to compromised WordPress uploads. The presence of external URIs and a high ML score further support this. The primary attack vector appears to be users being tricked into clicking on links within the document, leading them to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://infrive.ru/uplcv?utm_term=cultural+empathy+in+counselling PDF link annotation
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/rovpnpvrni5g6du5gpknd1ngg8/4149713383.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/179561f03dc3fe81ccfeeb9030b42754/13875155722.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/3m1ub1cqv6r2opkbo7682or3br/76458174002.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb169e7467---94125375854.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/30a65905b361ec95d62ef98ac4dfe401/53039281813.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/11276aed6f536966e0d753c7f16be4d7/11586884070.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/ae3262cb27f122a0eaf68ad54d3abbbe/xivedelosoxagabanonabaf.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ad68483ca---xivumusera.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/49031730635.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/kljn9lu3rn9o228euv9534rljr/bapowiliwenasujokepekaf.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/jagavajewin.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/61641558126.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5b1d6b950---sinekagaritiveziwo.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/52790787395.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607674e588c76---dinetuliferepeluk.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4c5facff7---fokaxoleduwofamuzogo.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/ea9523a5924a294c1cf2b87269bf7710/41316216373.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/befolukaputedasup.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/nhlnubg69dk328sfsh37m9av36/60374896118.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/33664341041.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/77550508415.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/10486884959.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/nafumafif.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16099ff6db4063---bavafizikimobatasevo.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/891153bb579a567ad73865eefa72eca2/resenovawomikafabonitu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003f7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F7BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00040fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40FD3 11064 bytes
SHA-256: cd12a85eada8e85b52e6d6e8741ab6b0024761a9e3daef61cd4bd9facd168454
font_02_sfnt_off0004297d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4297D 18760 bytes
SHA-256: 0b4cd5ae4b68f8acc9899756e7c59bc8203859c8b183e9a36f000d0599e2c1aa
font_03_sfnt_off00045a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45A95 32088 bytes
SHA-256: b22268b33f56709b6ab108d24bc6409809493b130048d791d1b639a8779ef5ef

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