Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc4b4f011423e6b…

MALICIOUS

PDF

73.0 KB Created: 2021-09-11 11:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f6d48abd8206b67495350658894bd30c SHA-1: da798c1ef165fc00ecfc54811703660a6f577de9 SHA-256: bdc4b4f011423e6bb075971b973ed20d2be939bb4b4e79d9db6bb4d517ecf165
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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 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://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/43151193095.pdf In PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/36215130159.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/7d612dfe90bae2e623ba032c029f8ee3/56523322339.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210902132913_1071783210.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ffe3fce7a5c29427859e6f259ee22389/pazarijakoduzolugutogizo.pdfIn PDF document text
    • http://hidropro.hu/upload/12579729569.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/19088131996.pdfIn PDF document text
    • http://adice-area.com/pictures/files/19718696703.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/92858776742.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/setudazelofi.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc914b68e---71051076538.pdfIn PDF document text
    • https://activepymes.com/pub/file/kizidibeluzi.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/87467184214.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/38241304824.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/gudenevopokoverodazovaj.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/ninezotikamotosijosij.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/65173507539.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/nupeluzoka.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/dixub.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/297fe1e2a1a2ed87851bb7bc8ac1c2f2.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/zuser.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/96344701174.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/4276339234.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/34432822154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=need+for+speed+underground+2+download+pc+windows+7PDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/taponajorove.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_off0000bccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCC 15536 bytes
SHA-256: ec2ecebe27c6442aa7c796c1b64e26ae016111dc2b3ceaeea509a6d0353568fa
font_01_sfnt_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 11032 bytes
SHA-256: 8161eb1e46a51c326fcad406e5eed57b58afa5192f6d257aa23ace32ef6bf313
font_02_sfnt_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1