Malicious PDF — malware analysis report

Static analysis result for SHA-256 698aade13cfb0ae2…

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 23:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9607ccf8a4bd66193421bd731a95b035 SHA-1: 97cf2216a1f04ff13b1c8b40214c386f5fd7b47a SHA-256: 698aade13cfb0ae2e25ac8120251af3f07321dc46acf1daf0de6987d6eb8126e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristic firings (link farm, compromised CMS upload) strongly suggest the PDF is used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=timex+chronograph+indiglo+manual PDF link annotation
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/911a2358a754d5927d4c7d378848fad4/80984818599.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/6cf1330e49440934cf753bb58b9cd647/68914899414.pdfIn PDF document text
    • http://debden.org/userfiles/file/67465582594.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/26436018067.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cb5f57dd6---66057878454.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f88f2da898---goxalegom.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/74247660721.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/zaxof.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/pagoponaligakigamor.pdfIn PDF document text
    • http://schokobrunnen.com/idata/bubasejukuvotanazekotapi.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/81baf853e8de1584b2f80086d46f97bd/26050636061.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/sulofudaga.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/peserama.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/vu6dvr6mstvh4k158oe0n2ucgg/saxisegukigewisuwab.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a513ea97df3445b7c244af7337bd38e3/61170166790.pdfIn PDF document text
    • http://3sdent.com/upload/files/gubufonufotozamupafozid.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/rosonavevow.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/delufenazanip.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/josebotaropuzijidapoxudu.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/63978445066.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/eh7u357sqph8232in7pg1ro0u4/tixadedudafisuje.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/46071543623.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/nimajimimixutoraja.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/93ea38fea1216f2096308dea9c457234/bafuboropove.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_off0000c7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FC 10860 bytes
SHA-256: 61b9e4fac1e61298654d995794a92199e5af20fb0407da894e0230d6cd66710d
font_01_sfnt_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 17884 bytes
SHA-256: bd04ddc4060088f0516c2f334d7b143ea875aca8a96dd8fe47316e28674bb08a

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