Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d616df09c8b4ee…

MALICIOUS

PDF

83.5 KB Created: 2021-08-19 15:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 6a6f6c8db5744665e1cfd08dac05f484 SHA-1: ae4fa076c0eaf899fab8a215b5e3ccfa9384e93f SHA-256: 18d616df09c8b4eeab3078715dd0473226bcf33ed879fa325cb0bb687cae8c81
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting. These links likely serve as lures for phishing or to distribute further malware, aligning with the characteristics of a malicious PDF document.

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 https://tkquiz.com/userfiles/file/62338747397.pdf In PDF document text
    • http://paitoonbox.com/userfiles/files/mezir.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/8ihvj24e9a05heaov6crjaivb7/xatalezased.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/72db8e68672fff846b80a0fbbceba8da/gutabadufunibotuvaroden.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/jakizejafegewezibipojid.pdfIn PDF document text
    • http://lblussana.it/images/file/gijexidaralovovid.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210726_9AB0105467400EA9.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/fbr1oavvd5dc6fbispdn6lnver/71942466910.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/da21eb3245a970dd8ca31a6b3ca3b3a1/2457809536.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/dinafesa.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/63267169958.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/882cc7d5f1e491fe50c1a66715a49042/xitovobirezobisomadab.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/r3aau6kgabequmif83j48eb92v/lopavawuwifowibulaw.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/53244226651.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/venavofigomuvudu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae43931ae42---81450323424.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dfb8cc4cce---72816432086.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/wuzowa.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855d45421d9---70063074293.pdfIn PDF document text
    • http://cityfate.com/files/files/sonagitajapiwidepopunawe.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846c1970c34---6580587723.pdfIn PDF document text
    • https://diphong.com/uploads/67661233206.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/62208737447.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/vefuged.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=schwinn+140+upright+exercise+bike+owners+manualPDF 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_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 11668 bytes
SHA-256: 6a5f438f07e3e000f652f3c11acef005906afffba925b9081adf901263303c1e
font_01_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 16096 bytes
SHA-256: 64584aa11b07560001ed4b0fc78178d641d25bf49ca991c009d850169b702dfa
font_02_sfnt_off00012891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1