Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb946be7e090786…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 11:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 409979eda77bdc34cedfa285df1a75c2 SHA-1: 1d4ae7733dfd2eda7efaa190a124d51aef7a964a SHA-256: 1cb946be7e090786fac78041cf31e651784f940713fdfd2c3ef00b2f6737ab62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://thekitchendesignstudio.org/uploads/files/46035197134.pdf
    • http://chipublichouse.com/ckfinder/userfiles/files/kaleninitakemibetowoxamu.pdf
    • http://www.aragonemprendedor.com/userfiles/files/12893746797.pdf
    • http://mycoapaisyl.com/webimages/files/nisixiziredojon.pdf
    • http://www.elstar.ru/uploads/files/8686682268.pdf
    • https://autoskola-scp.com/files/natorakudijetotodujosaku.pdf
    • http://betheaskssd.com/flash/betheaskssd.com/file/dewazedo.pdf
    • https://www.hsbofmn.com/ckfinder/userfiles/files/pevifufugutojolabipulizuf.pdf
    • http://dentalcenterstudio.it/userfiles/files/98966959947.pdf
    • https://samsunyapi.com/userfiles/files/91603055960.pdf
    • https://nurdagihaber.com/resimler/files/tofawaribuzosir.pdf
    • http://ccsctda.com/ckfinder/userfiles/files/20210912_054829.pdf
    • https://muachungbaohiem.com/uploads/userfiles/file/7465870655.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de4578ffbd---jekaxoxitepewuw.pdf
    • http://kemnhapkhau.com/upload/files/89701255062.pdf
    • https://asfus.net/virgsurv/userfiles/file/54367086142.pdf
    • http://twinmd.ru/userfiles/file/gazezunitujesisakos.pdf
    • https://markmont.eu/editor_uploads/system/files/dasemuvawuwewigekid.pdf
    • http://autosoftware.company/autoresponders_images/files/zerimaferabu.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/16e17e26322d3538b81c2f8eb696427b/34447426084.pdf
    • http://lionsmarsala.it/userfiles/files/pudadarusorad.pdf
    • http://mutamobilya.com/images_upload/files/58467512013.pdf
    • https://tunhuaduytan.com/upload/userfiles/files/27170352668.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613012ff23f3e---notesobekopajibivomalas.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vedafizetibidowowopefim.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613991d6652db---1418235269.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+game+hacking+apps+android
    • 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_off0000e051.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 16792 bytes
font_01_sfnt_off0000f868.bin
a8eb129c552abdb6fe45055205512fc8c7f35f42db06905152ad9893b4f18ea6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 11060 bytes
font_02_sfnt_off000111cf.bin
8202fe4b985220f74b1a21a853b73264614bbdba5f8f779ab8d926e04982077e
pdf-font-stream PDF embedded font (sfnt) at offset 0x111CF 17616 bytes