Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0b50676f7d694c…

MALICIOUS

PDF

103.9 KB Created: 2021-07-01 20:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 59d2ad975f63a785c9901003807cbfa3 SHA-1: 529bd200156426b68908996da5c73339db9b993e SHA-256: ae0b50676f7d694c55273cbba1bd9e6fd58c550b9df1c56e468b822724420a21
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to external websites. The presence of compromised CMS upload links and disposable hosting suggests a malicious intent, likely for phishing or distributing further malware. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

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://infrive.ru/uplcv?utm_term=building+a+model+railroad+step+by+step+pdf PDF link annotation
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/32061832029.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160967829b55c8---1573034012.pdfIn PDF document text
    • http://meta-min.com/files/78523002560.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba9cef408---remujenapikopodoxugipiwer.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/07cd67cb65d3a9e961bd698578e767ca/rutakurudosexorupu.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/xojivofakosa.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/gejunelodedozisi.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37956c3736---85500680343.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/bt245brn7smnhufg4a7ti231fb/gepobajopewi.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e137ca52b4f219f6f72a207d0f245ffd/58277058264.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087f0a99a115---82231741901.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/75effd1b328ff81df1b0bb2dea8fabe3/35723884723.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078749349c3b---jifufefopoti.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/sizupoxonululam.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e52512e5dd---dezitaxixunafejakize.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/97a14d9ec2f28aa44cae5b2645aaba10/wutukosapuxolinekixuref.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ee09023d6e88738d0f7166d53e971325/zijuzuf.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6587e70a6b---81503999112.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a4908a1fd87---fujapuzezoxunox.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce407571a7---52329052080.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6c7572e94---dewitikalelopigir.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/435eaf6ba1742efa29ebc0753f1ed420/55384318886.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901eb3c1f22---29594638280.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/kuwabemur.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31953a1b55---90776211649.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d3e37d27ddd5ccb80b07386c929712ed/pixal.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_off0001182d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182D 11248 bytes
SHA-256: b678445b20d772efed789bf26d56b31f603bedbde2fd53d40745f2c03abc8cd5
font_01_sfnt_off0001321f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321F 18148 bytes
SHA-256: c06d34fcc6459b5883749397208afcf27fa7f48bfed64549da8be7ff6eab2576
font_02_sfnt_off00016158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16158 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_03_sfnt_off00017780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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