Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d79c425386b6f3…

MALICIOUS

PDF

116.2 KB Created: 2021-06-19 15:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 26f7cb5575b01c015acd22fa43bc3282 SHA-1: 4d0d0d45a7a4f0be894b46860a52206dd61975ec SHA-256: 19d79c425386b6f37eb8634acabd0ca47ffafa59ac108e525bbb17a914893bff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.bufolari.com/public/immagini/file/13873008520.pdf In PDF document text
    • http://rld-carbon.ru/file/tinegoxamozuwotugekimek.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/097b0c0d234f5bb6c5afc2368dc4fb10/89327019460.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/6a79438e82e742bf327e8d15a79b3878/38227917248.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/gokosugo.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/l3m9i6itiq9dru50m8ejun57rf/domikufixofekamuwati.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/93559980404.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bbecf5ecac9---pafilosupexil.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c33d4c8e---32195238686.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca94cebf3---17071498646.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b7dcacc6b6929e4d7711b37eefe5b261/44736585178.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4db94d1a6---47647799536.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/bunimigifokukazes.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/23310654073.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/e1k7u5mvg178f8ofna63v9iotm/95488850808.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/18236160706.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=minna+no+nihongo+fukushuu+b+answersPDF 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC528 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000d5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DD 49800 bytes
SHA-256: 3600d59f4959a931a69c800343390abea77a0fd6520a8714bdc4fa8ba8d6fd15
font_02_sfnt_off00016f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F6F 5296 bytes
SHA-256: 7f470ece889ea6242ede5f3be089f4dd6177cbf0b1bcdc07599fb3dde3792eb1
font_03_sfnt_off00018191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18191 2196 bytes
SHA-256: be61b0542d57414698a387a524a35f385b622f32db0c0595f9d50384633f89ad
font_04_sfnt_off00018b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B91 21104 bytes
SHA-256: e2a0156bf75990c227ba562535c79d87650fb97e28ed4eb44c86c2d153ad73d9

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