Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3cc4e1f621e0e1…

MALICIOUS

PDF

79.0 KB Created: 2021-07-12 16:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c815b12b4136385b61fd9338d7f78d41 SHA-1: 4ed3afc00066ca6b876655affb5107116cfd19f8 SHA-256: 7d3cc4e1f621e0e190f37a9358dcb0b23f4ab79d65c80253ff79ad5256271477
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting, which is a common tactic for phishing or malware distribution. No scripts were extracted, but the embedded URLs and the nature of the link farm heuristics strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=to+freak+out+meaning
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fb906cbaa---99327712713.pdf
    • https://kingyao.com/uploadfiles/files/20210614_134656_7582.pdf
    • https://ancoraeducacion.com/images/wogugaxibojeg.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8ddc914a---mobof.pdf
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/nokapufilit.pdf
    • http://kursadowicz.pl/Upload/file/bagumiwenuzekunazu.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2mhcukmi13abbhbi9t6lk2l3h9/61280557187.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8eae971832---12265107141.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/fc56d542821293cc30e7f2269c05f363/nuzovalegefadup.pdf
    • http://colafranceschi.it/userfiles/files/88893309555.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mbrb4n9qm4orgf2fiffvho2l8i/dobigitutidefawepi.pdf
    • http://www.sport-konyv.hu/userfiles/file/forokekesaguwariveku.pdf
    • http://adveotec.com/img/file/31451293090.pdf
    • http://benetalent.com/upload/files/marawi.pdf
    • http://seyrimerdin.com/userfiles/file/gogizulefizit.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16082c1a9c0e9a---22036431316.pdf
    • http://shuimotongyuan.com/userfiles/file/78984624970.pdf
    • http://mai-colle.jp/userfiles/file/jokireniwivuxafog.pdf
    • https://tomas-music.com/contents//files/58931600255.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608101ff07973---96991733850.pdf
    • http://afghansolar.com/userfiles/file/tabuxegidavegenopasit.pdf
    • http://guowangcable.com/d/files/wumulufuzikawavobomewo.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd21096007---nogofoget.pdf
    • https://mediaget.com/userfiles/files/44423077560.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d04b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD04B 16792 bytes
font_01_sfnt_off0000e862.bin
ec3ce3b776daf4c079abc1242d6b53744763740dadafe3ff3390751bb4162c5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE862 10496 bytes
font_02_sfnt_off0001003d.bin
5fd5a0f4864b360745931f0c095bd56148ba97d724afd15aafd49523e6499208
pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 17640 bytes