Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea2bbecdae1b8166…

MALICIOUS

PDF

87.6 KB Created: 2021-09-17 16:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 073c153374967a2869c9a3e380aa82f7 SHA-1: 1dcbb7116291c6aba876eda4180dacb6da1923a7 SHA-256: ea2bbecdae1b8166b79daef6a92e68db8b4d8d412cc937ac7bb26116db2b2477
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://inwebjor.ru/uplcv?utm_term=why+my+phone+does+not+ring PDF link annotation
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/022a0eb036e7da59d2948dabe3cb1b29/doseviwojipezi.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/fipominisad.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210909_718463AA4CA5E58A.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/90473106083.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/0410eca704913fd40c96e69ad40b5ea7/duxakasirusukodojo.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/gawifofasolil.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/dizubalumew.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/tixonatidezi.pdfIn PDF document text
    • http://telektrans.hu/editor_up/66561355210.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/kajuzekaval.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/8ec889ac054abdb5eb1f21a2c905b376/mitivosakefare.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/lijelapaputuvutenifun.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132d5e30024f---roxuneguputibuguroxaxuno.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/91840385669.pdfIn PDF document text
    • http://ttc-investco.com/img/files/tevupewusul.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/wugajonelo.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109061857095060.pdfIn PDF document text
    • http://tzsunup.com/upload/wadapojavaxewefitis.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/f3ae54a4d014ff77ddadeb2a707ee229/81968739317.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/sikokamoge.pdfIn PDF document text
    • https://luminex.pl/upload/file/jasizilemuw.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_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 10740 bytes
SHA-256: 109053e24eb20a6c214dba0b72eafd5f82da0b075142aa95de1943485fa257e9
font_01_sfnt_off000109cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 18204 bytes
SHA-256: 7a62f9f87719a19cfe7a275c402a2f09904bc1465d6cc221aa6f9ecd157e0910
font_02_sfnt_off000138a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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