Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8a1d08ec1a4522…

MALICIOUS

PDF

82.2 KB Created: 2021-06-27 22:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c37ddc60660853dc33cda863ea34971c SHA-1: a383b77102c700b004d00e1cdce9bd74d336ee37 SHA-256: 1c8a1d08ec1a45227e27452d928c1892f82cbff7b2531f2033a69b9c2acb703b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to external resources, which is a common tactic for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns suggest exploitation of PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://sbsinternationalschool.org/sbsisnew/userfiles/file/33718919457.pdf In PDF document text
    • http://hndgyl.com/v15/Upload/file/202165122578680.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/p2u395fbc4bn4kkcmgl3gruje9/42500595128.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a66e1ca436---67117178025.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/33775312522.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9775a0ea6---relododibubutiv.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/09583d7fdc5f98d6a8bda0f270513da8/69543614009.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/37647944267.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ag7jmirqvpudn2sohr9ca6ep63/vorupugi.pdfIn PDF document text
    • https://samowar.ch/upload/file/82391676343.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160903940880aa---70124618253.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7a9b291805b4873e72a118e84449ee7a/makawoterufe.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/o4519r9hj2qklrao4ec5f275t6/85589293356.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984330b672a---18843337520.pdfIn PDF document text
    • http://christopherdallo.com/file/27051573251.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608391e77d242---3132567861.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/e002c0864a5b77cde7bd2fa9a472dba5/bogif.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/4568b9b749afe6bf8bbea90e2e097fb1/fijuzarar.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cv7bketjqa2t6tp06g1tvden01/vatupezufasebo.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2300e4baa68139d031f6868426208bac/vubineresusasililesus.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/jisadefugaxok.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/28387b527d776131a673d2a3f6f150a6/fizeminomepapinimoda.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/meboguxopas.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9932240da---davarefodororun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+answer+tell+me+about+your+researchPDF 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_off0000dc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3B 10836 bytes
SHA-256: 4c28e84dc44d5ce75f5bba5a9f2cc1e44a43773d134079a9bb8e60248af1ff31
font_01_sfnt_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 17524 bytes
SHA-256: 884371e9fac9557fe03fee9eae924843a34a0d726e340a1bbbefd050946b4f2b
font_02_sfnt_off00012302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.