Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfed1aa79cfefd47…

MALICIOUS

PDF

87.4 KB Created: 2021-09-06 04:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 657017d8c3de2bf23171076424343752 SHA-1: fc97ec3bd59e830c3231a04e36521f85b9b1e29b SHA-256: cfed1aa79cfefd4772ea7f13a00539bc311ffcda581a9eb3edc647803639a746
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting sites. The presence of numerous external URIs and link farm indicators suggests the primary goal is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://gamjagolla.com/uploads/files/nefosi.pdf In PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/38803547171.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/25f06e0afd6bd81b4dd55036ae42c6b9/28877123796.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/gidijazuva.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/rropcute0mj4vsft7qikgja8la/79440005684.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/bavine.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/mivuribu.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ba2f447a10b2b077ce4ce54e76b911b0/19178937774.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/zexoguvozapovovexo.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/wonifimiminozevaw.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021062101305970554.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118359259598---jewuki.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4446f1be49---wojanalodijimav.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bca01422496---40547370928.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ofv98fgg3bn477s1s2lspo5pq4/6907948283.pdfIn PDF document text
    • http://denledmpe.com/upload/files/xukurotevijagopikefisam.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/72159a7a66db95454d85d627aff05567/kosajadagipokeb.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609620e8756d4---xirepinemimapojure.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/1442978093.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/jizonikajokugorutolabo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082298db79e3---32795006545.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/aefed3ef2c1ff0233410a955628159d9/23974840325.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/pafaxoniko.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/61743267757.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/59648974463.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c63a394be---fedewerumodubari.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/5492671456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=estatuto+da+oab+pdf+atualizado+2018PDF link annotation
    • 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_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 18968 bytes
SHA-256: 6e2cf4e168497ea8eb719cf8cb72a94bb8de17588a0510c9abb90039fd128692
font_01_sfnt_off00011e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E65 10940 bytes
SHA-256: 6ef2d88802c1c1d9ec566005c3325ca8f202c98d4166ca30b1aaa783d843bfcb
font_02_sfnt_off000137be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1