Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d8a4f0ddde2064…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 02:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd4bed6bf23526d8aabdc09f542aa6b4 SHA-1: 74bef46b1010e54010ef5701ff6d713b78f62a7d SHA-256: 78d8a4f0ddde2064c349a9e0c3e49dbc7e8ec7307a5dc865db44c83fbf22b92a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to lure users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://zonweringbelgie.com/ckfinder/userfiles/files/ganenugejoripemoju.pdf In PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/e3221e6f4724761a7523ff256074c1fe/64117657954.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/07/file/91563628719.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e345c654080---55811584065.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/19b7e44be85b971f7bf1869f3c79599b/gunutuxad.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1611d14b180899---vikasarugerafatimuxadifa.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c07d4fc33e9---42486533806.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa2da7cca---81706928582.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/fuvudixuvimukatun.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090725de7279---2571895433.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608639887af9a---jabogovi.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818b8fd2379---zoreru.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927bc879bee---sulesatogadan.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/eslk7tsrauu9hp8oco5ck0l3v9/88531526162.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/3bie3ukrscfnh366dl54tg4s3u/30599135848.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/rogegidaribododejivenano.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/papisugijes.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2b192f29fd2561cb7e4fbf0267de7e03/zobalagifazu.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/98678939448.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/45329627960.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/5b2a78b8072625b610fd7ea4f27e77de/73172319129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=you+are+fearfully+and+wonderfully+made+by+godPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210808/16284137576617.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_off0000d1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CB 17664 bytes
SHA-256: aedb274e5f0a3563d0d809c336ae98b7b8ce0499aa42993ddccb3bcefcacb86b
font_01_sfnt_off0000fe99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B0 10760 bytes
SHA-256: e55a6de1366520b0f620fd3648b4eb02d5d39efaf0f3f6f49382bc7bad43e0b2

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