Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ff94561d8c9175…

MALICIOUS

PDF

105.9 KB Created: 2021-06-27 10:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3f657e3d68f271f1b4f5590f09d95791 SHA-1: 429f43e2fe278e3a8f5b735c83e39e7aeb6d078b SHA-256: a8ff94561d8c9175b0f712ee8d901b2b9617a7821f538bc902ee7fd415e84e38
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the PDF_RANDOM_URL_LINK heuristic suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=famous+people+from+roscommon PDF link annotation
    • http://allamericannursing.com/userfiles/file/70246344557.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077708c5f334---jotabarewojug.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/nomazivunijeveze.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/78277424582.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/96047077214.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/tsp8c7tn18945rue2r4a499iv7/63982382438.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/einalc6p067pook69n7h0dl8b7/33064166240.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/46233107525.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/gixoboximemuroranasoj.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ee151c868---gudatapamu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f297bbbb10---vukaponurot.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/95648201120.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/47056109557.pdfIn PDF document text
    • http://charivne.info/images/file/2259940076.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9f9f0f8f2---foxifemeg.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8e41cbeca---78556922360.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/4a619091d7486e6b3f54536e10bf6ec9/legudexelakagesikipaxi.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/rac6cdmmg9ojmm81dv45cumal4/vezupisasojozuvepaxaji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06bb4806fe---bejowuxo.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/28547466328.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/ed0801a71c8a8cbbca62af0534c26e22/71490086013.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b42d3890f5a---74853202218.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/f6qbp63psbgc0ess211lbkf958/64479939745.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/82378aa6f97c7c7766d42e14c366e7cf/25867605828.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/56794515d8f202554e082921a504186f/mojinureke.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/15066933982.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_off00013bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFA 10528 bytes
SHA-256: c27c435339d4371762a2e5c48892fa321e2143aa3eaf01be41c6e91d026bb9a3
font_01_sfnt_off000153f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F0 17940 bytes
SHA-256: 5f05dae52f44a737b6373c8a9176f59dfe2889a9a3825e7cacb62f4dee734c9a
font_02_sfnt_off000181cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.