Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa09ff013581516…

MALICIOUS

PDF

87.9 KB Created: 2021-07-05 05:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 565ebeae34204cc4d3ce080e6573031c SHA-1: bb937f26d221889db39bcca3be16d9e71053eb69 SHA-256: 4aa09ff01358151668ed535032d030d03b87cd002abe01ede2f207180fa13a39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The document's structure and the nature of the URLs suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095ee6089d2a---72683087685.pdf In PDF document text
    • http://brmxn.com/userfiles/file/20210703224518_3t3o7o.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/u3akmv916ivgvben53cfjrcq8d/fujominerixezajediwamu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c8ba1e1d1---komibemexuvivutatamapitam.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/3bc5637339465fe4b108ad33522738de/kevobuxor.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b0c1d7ba758d1ed0f858efa9a3251479/58868441851.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/69771f1023c54277091f877eb40b02db/nusopimi.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a21002e9f1---temopanelavebadatu.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/87731335270.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/zoxusugaridutalibiwed.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c001453f0e2---livoradugunolawesa.pdfIn PDF document text
    • https://33mobility.net/uploads/files/16316126152.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/eb55d74503d78a784ef824ddd40b3e75/rowurozubujedekonata.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/fb28325eed4bb1059792872f8ec27564/67065757106.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093fa4d2cafe---75492562288.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ae02c6ac59d3006e8f6c9bd22d0fc7bd/wivaginepavu.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/ho8f6qtlifo1ics57bm8rv53d6/49921004398.pdfIn PDF document text
    • https://bem-sa.com/img/file/tulikisudosowuk.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075e24d5395a---wugup.pdfIn PDF document text
    • http://bociany.sk/media/file/kadonuf.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/jekaz.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6b194640---tujid.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9880da538---sejuzikeriled.pdfIn PDF document text
    • https://aneri12.cz/res/file/nowidevezisoxedudu.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/61572854570.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/tipokabekam.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/70b7d070c22cb7fabbc05531f51b9b22/78043023596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+papaya+good+forPDF 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_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA5 10600 bytes
SHA-256: 4e16beee0f28893d29b091241d7fde0937aaaf6dc7f9d667fa587d3a868e364d
font_02_sfnt_off000125cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CF 17092 bytes
SHA-256: f3ba1efe4c8e7ba335889873425bb0bb445548f807cd71bf75d95a4c0328cd32

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