Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0af5efc9ac3bad…

MALICIOUS

PDF

96.9 KB Created: 2021-06-30 23:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ad7cd88abc4c488e74e3f0ad2542dc8 SHA-1: 4a23cc5ca92ca9b813c70a37abefc393da530d98 SHA-256: cd0af5efc9ac3bad342e865571300fc1b58001219ef28f96ae5452c6585b0266
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content-based clues, but the heuristic findings and URL analysis confirm a link farm pattern designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87de9726ef---10743240723.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a758c7552d2---36270131513.pdf
    • http://www.ujepites.hu/userfiles/files/58644012124.pdf
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/12778981760.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56c07c730cb563647e3fac2e4f053ebd/7879790873.pdf
    • https://groupunsur4.com/contents//files/5016902401.pdf
    • http://viewcs.com/partner/upload/dextfile/gufixapironexo.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608046fa6dab4---mexefobajojava.pdf
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/nazazoginezul.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/etsr3s677nk0kkocj0glrjpgpg/77954732755.pdf
    • http://fedoro.ru/upload/file/falololexulitopidig.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/lutedunituromuredafir.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b006684a3154b6a7063abb77c41f71c6/zajimolar.pdf
    • http://lnaixi.com/userfiles/file/20210611191638_1933549051.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd8873f325---62813269605.pdf
    • http://iberia-ex.com/images/blog//file/lerubemefeliv.pdf
    • http://sethhukumchandschool.com/userfiles/file/fibopijimotoxog.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ijg6flllelshhtk7f6dnqetifk/91319661757.pdf
    • http://3colorjazz.com/fckeditor/userfiles/image/zezada.pdf
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/wodegazodixudukikuwaxizu.pdf
    • https://mobiligennari.com/userfiles/file/76203626734.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/512cv2uclkosl70883td1rosqd/posoz.pdf
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/11246905710.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944893992d0---78200112488.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2baf95871---25536416067.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+all+starters+in+pokemon+shield
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe42.bin
b658c45e87b519118bd2e8428e4a776f44f85d0ab196f6a36a6f24e173d1ef1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 11008 bytes
font_01_sfnt_off00011770.bin
210b0325e656a55b6769fa41319c4e57000b9d1c6cc148c7384079dc42f4b2d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11770 17788 bytes
font_02_sfnt_off0001463c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1463C 16792 bytes
font_03_sfnt_off00015e49.bin
643f11bf04f9dff6930f9ffa735b4a2b2da79e4b0dbbb32edbf0ac4b83193779
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E49 5876 bytes