Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7d0c554ac4e11e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-16 09:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d6b9ee07b30efe00ff67adee0b35b90 SHA-1: e64f3c73c1299dcae6e7f2c7f462b7e64bc86b9d SHA-256: ed7d0c554ac4e11e43a94c1c3d3ef9881089d14ce14c835b700e4248a980efa0
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links further supports the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=jj+smoothie+pdf PDF link annotation
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6820efe6---9225217007.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/469312e54ce02f85dd6f3b74d0fd30ab/35958883386.pdfIn PDF document text
    • http://ministerium.pt/files/gukod.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/35785395539.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/wikuzoponozo.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/sewugixiwiwow.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/56203058742.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/kidas.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/ce98e2babdc848551c0936da5765497e/kuweleta.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/tewufuwimomogajafowu.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/39284372799.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/subonutenijaf.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142422a1409d---73670307306.pdfIn PDF document text
    • http://terminsk.by/pics/files/56132338700.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/pokapixijoseva.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/44594100341.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/gobukafavozukozobibu.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/42640798590.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9784d61b6---13638821867.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/wuzabilavigilusoxu.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/47022317988.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e03afa8c91---19217011848.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/dulebano.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_off0000b3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E6 16996 bytes
SHA-256: c39a0d0333c6e8f40fe37a55a4d39ddabf418760a328b087a4b0d7ffcdb03c61
font_01_sfnt_off0000df38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 10472 bytes
SHA-256: 91c4dfab1608b9b0537a28dcf2061627870eec8be7cd8731b4a4101addf20d2e

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