Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5478e7913d6de16…

MALICIOUS

PDF

72.2 KB Created: 2021-09-29 13:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d3ff5fb54dcfb0b88c95aa8d171928ec SHA-1: 45f5cdd377862b687b21aec7f26df64c8ec7e465 SHA-256: e5478e7913d6de16dbea3a84c50ce590493e10f290b9a328955c0206b6099e95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The primary purpose seems to be directing users to external malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://smidgel.ru/uplcv?utm_term=reader+sony+android PDF link annotation
    • https://cape-electronics.com/media/file/melajuwikewon.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/29748536008.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/wuvakuxujumoxofonipunono.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138e85b89bc3---37976901512.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/ruxijemepafonukifida.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/40442706084.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bd6086c66f752aa528afcac730eb70d9/fuvotezi.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152e194f01d2---safavufinotuzujajes.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142f747aa5e0---bilajakumirazoxa.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/winovagab.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/98130879505.pdfIn PDF document text
    • http://boldogelet.hu/media/20175568809.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091407503773499.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/tegefiminubapilut.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/54091600374.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/15748203594.pdfIn PDF document text
    • http://pnalog.ru/images/file/jofusexisunawa.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/26947107618.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/40766462643.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/pasapuziwevijowunozosotu.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210905114457.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/16667855315.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/54083077985.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_off0000aeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAB 16484 bytes
SHA-256: 61b411f5e8ec136d65e7e18488eb0dc2b465554b62a971ebff77ad5a4e148500
font_01_sfnt_off0000d8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 10256 bytes
SHA-256: 2ed83a4dfe2ac4597dfa3b36ae83b05e6c51d9a7ca821ec3be809e4e525b4e57
font_03_sfnt_off00010829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10829 2108 bytes
SHA-256: 38e17e910acd0ecd6e7ec5e08d122646fca611ed1d66f8fa1ef2254d0359f180

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