Malicious PDF — malware analysis report

Static analysis result for SHA-256 d957efce84067c5e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-01 20:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8239bbcd48932b760a0ad69548b139f6 SHA-1: 2cf5f6208c8bc6c2058a67cf30ca4343d734c030 SHA-256: d957efce84067c5ece558e46679c86c6b3b48c622a4bf3279d721beb954a2490
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or downloader lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/04575d193f53197077988419a0246aa8/nugefujutojanopez.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4daa58674---simugaxeruvubudiw.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/poduxeposekusapuwaz.pdfIn PDF document text
    • http://vce34.ru/attachments/file/20892595899.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/xutufivatusekakafejojaga.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/b1d0a4a28019a42206f68128acca0c27/25197065127.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/bejupebuf.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/61477062839.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c78546aea4---wumifumu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da6499db88b---28474911389.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/wamukenelivujelagemija.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/piwuripazafige.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/34080852684057c3120885ddbacaccdc/9300600156.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085af2954d2b---vebuxezijuvekotapofowuro.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/e8c49bb4d771cbfd410e885c508acf22/60622334219.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/pavune.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e317b4806---19447556353.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/78837648577.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/140d21d5d35be8518826a1af71d8542f/nuvotosuviwinorimakowon.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/31a7008404c4f67ba015466967958d0f/27385006576.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/86793056721.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786300ba058---62316235753.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/tnh496okjt880aj9ntggcd5bup/81288010583.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4efc942cc---50217307920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=class+7+science+lesson+7+question+answerPDF 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_off0000b9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1ED 10636 bytes
SHA-256: 2ec4704aae3bddfab1dfc743cd5affe488ad4d8a20079f651968b5f7e39a3c7b
font_02_sfnt_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 15676 bytes
SHA-256: c85ba857f440b29c640f77265dc3946b4a54df9ca259ca09a7ec9c4c4a478ef0

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