Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efe1e09647d483a…

MALICIOUS

PDF

102.4 KB Created: 2021-07-31 03:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae4c148a5c12f2aa8410e0ea7a27ca1d SHA-1: a25c9e6d55804c6a430855305952959204538432 SHA-256: 8efe1e09647d483a0cfb837c7c2e3a095d02b7617aae0fd852e278f799562edc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, with heuristics indicating a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or redirection to malware. No scripts were extracted, but the structure and link distribution are indicative of a malicious PDF designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://techniq.ae/admin/uploadfiles/file/jinijezakiwobakivofebilax.pdf In PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/moguju.pdfIn PDF document text
    • http://bscartridge.com/pic/wibuzex.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/070546298444.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d03aa177716---64604936476.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/92804313163.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/vusekejeketidodajok.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fe9ea7639---topitiwibopulibasonemat.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/66e405ed0fd3cc1819d3aa4d6035b95f/webenijifotewujajo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f14163aab4---lonagevaganulit.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c5dd28b0c---zujutunoxazixizegezud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607054d3bbcc8---33918447693.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091fd5a8c9b3---baromomivukusiwapomag.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/potududupesidenabinen.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/sapadopusuwapan.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/92779312089.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/df115a30726d8a326bb601a20d913f06/23139467276.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/tobapigemisoxomegoza.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/6cc518db29a82b8be1379baa8e573743/56768513985.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5644f59a0d---julepapajamufexa.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0442b336---pateritipaxagubokufivopin.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/323f6f3c9f24b1640640cceb6a08ab74/16845274872.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/59280948310.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/liridalunomu.pdfIn PDF document text
    • http://scarpatti.com/files/88204052736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=super+smash+flash+2+best+unblocked+gamesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E65 11504 bytes
SHA-256: 343762a7ae3ca4d6779886ef118eb2f49724a18708b97812b8c77729b3c2f56a
font_01_sfnt_off0001390e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390E 1932 bytes
SHA-256: 78b0a163e4eaea4fd1c276a6e09b3ffe8714eb7cdf5cd8e6d31ca7f4d18684d2
font_02_sfnt_off000141f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A06 19012 bytes
SHA-256: 4dd3729b37671b8919e08f8d9365c7504df376e0fa1ae2e726dae274f4b40c33

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