Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd24ebb527ac932…

MALICIOUS

PDF

70.8 KB Created: 2021-09-24 13:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d66ad62f115439602d9ab52c624d8aa7 SHA-1: 73d2498dab47377e9eec39e5750db51d3efd9653 SHA-256: acd24ebb527ac93256c8932017cacbd96bcbd3f8616b1ed1890646394e6ef7a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate that these links are part of a scheme to distribute malicious content. The embedded JavaScript likely facilitates the download or execution of further payloads, contributing to the phishing and trojan detection by ClamAV.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://daehnfeldt.com/userfiles/file/pezoxijitob.pdf In PDF document text
    • http://kingkady.com/uploadfile/files/dajaxiderigubuxefewan.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddc8999e7d---wuzibomurawarawak.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/puror.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/31201853960.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/robatopasafori.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbfb7bfea9---tesapasotupajubusugefaz.pdfIn PDF document text
    • https://superpart.com/files/58217289590.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/94215869112.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/30956075207.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/63295844456.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/xiketodejodigusawufij.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/21313560129.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5974b9fb5---68888177343.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/99332607886.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/72426544078.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/japefabadoxiforuzonuseb.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/89758948888.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e02883b0a8---zawedemojubewuwiporire.pdfIn PDF document text
    • https://svltv.in/userfiles/files/61286836262.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/tenefaj.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/30700805912.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/talovatarexerujuvaragun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=flutter+simulator+iosPDF 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_off0000b2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB16 10240 bytes
SHA-256: 6a949c0c43e636ba5c27d0bd061337e88f406ea8d34dc9e8534b5111a168973b
font_02_sfnt_off0000e21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 17164 bytes
SHA-256: a52fb1dc7560ac94c45b04f28ab4212e829a8810de83b97863d95b2c5f8b9e16

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