Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac010bcc0022ec32…

MALICIOUS

PDF

88.8 KB Created: 2021-09-01 19:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 440844f1bcdfacda4afa94aa4ce53986 SHA-1: 42a3c9852ed42d77c3e5de063362bc3b7633eb6e SHA-256: ac010bcc0022ec32cd665ac5735871ba31fc38a5b8a603d22930f502ef7fb6e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, with several pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=skyblock+texture+pack PDF link annotation
    • https://ijpdua.com/contents/files/xepulelabapifa.pdfIn PDF document text
    • http://efrex.cz/files/file/14883918556.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/85762433726.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec2a08e35b---wanozelopib.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/7138124651.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/molotalij.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/xikurabasilixa.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/94203228405.pdfIn PDF document text
    • http://synowka.pl/galeria/file/55937324425.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/28456631791.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/46570638197.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/19918620994.pdfIn PDF document text
    • http://dzbnf.com/upload/file///wujupofepagojewijilemutap.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/61907207093.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b168635041b---564907494.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/n3b170cgv54fqga69u1h1tm9ck/51588405686.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/05a4b20e07390c6c04b16180290ca094/dozokedisavirakoja.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093a37a8ffac---70787788710.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b33052f1---88736751219.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3a4be7529---20546618780.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4606e6f33e---dagamoxaposewudo.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/7034556124.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/20638161652.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/26988258440.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_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED6 17700 bytes
SHA-256: cfc1bd1e59f76b58183b2ff774afe2779c407b18674217f9dbfaa037abc3ee6d
font_02_sfnt_off00013d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0A 10628 bytes
SHA-256: c7bc92e480ada5f6109c31547b4b8e2b91343dbad46ea0a11799dbd90d024b05

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