Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb075c6efea11e9b…

MALICIOUS

PDF

82.9 KB Created: 2021-10-04 21:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8cc153efb5b5e0b4eaaf9b5245e7b575 SHA-1: 56e2349f0ec9370fdd8a1eed652468acab70d726 SHA-256: bb075c6efea11e9b40a605d596cf0fe8b62f82ce46ebc6357a10bc851573f548
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. These links appear to form a link farm, a common technique for SEO poisoning or directing users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=venereologist+meaning+in+tamil PDF link annotation
    • https://pernambucoimortal.com/imagens/files/sibinefogotonujotarefeg.pdfIn PDF document text
    • http://runhouchem.com/upload/files/jatik.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/39905311191.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbf795b460---nijerajudutanibexovu.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396bae6dfc1---lozafeseruxarirepeze.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/febina.pdfIn PDF document text
    • http://imi.vc/upload/files/sananasirusodo.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/zajelimusewinitogu.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/sobul.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614487ce4c479---libidirosubot.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/roluseguluxovapat.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/vekukitotiro.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/ramuletegajinulewatili.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/24889403417.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/vamadefufamunira.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ae00c95abe99dad1e17ff7bcc8514ba0/gaserewolatu.pdfIn PDF document text
    • http://yztools.com/images/upload/File/ruxaku.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/falemorozow.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/97168396410.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/38383419891.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/60408688227.pdfIn PDF document text
    • http://savemaxint.com/files/file/50319718085.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/golabomowovesoseke.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/zamizusigaxavorexorike.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d514bef194---nifebot.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_off0000d4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F3 22556 bytes
SHA-256: 947d1110804bb31022d1a25101bccbe5c34e0ab69c4d07ca17456e5c11491ddd
font_01_sfnt_off00010ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 10420 bytes
SHA-256: 3ed1e8aa762f8e59670033735ecac96016f179b1140c2d071559e59b6a33f0ef

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