Malicious PDF — malware analysis report

Static analysis result for SHA-256 841fa78b81430298…

MALICIOUS

PDF

86.9 KB Created: 2021-09-07 06:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 940e23b44755808a6ec0d82b6a6584d0 SHA-1: a79fc26104dd9149fa6be46a7715a18fcabdc8b7 SHA-256: 841fa78b81430298f86fa212df67be5ac1b077a35b1a734aca06a091abc0e0c2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The file's structure and URL patterns are consistent with a malicious link farm used to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://huntic.ru/uplcv?utm_term=application+letter+for+lecturer+position+pdf PDF link annotation
    • http://kpdb.org/userfiles/files/lutedokerasuxiwiwasoles.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109061647527584.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607231a9719ec---xuzav.pdfIn PDF document text
    • http://hanifeugur.com/image/files/55555126345.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b45e3132---79623748771.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fef6fc654a---80361429455.pdfIn PDF document text
    • http://amandamaitland.com/images/file/vevoxowenuvom.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/dimadenuxole.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a759c26efc---jidesisobarek.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/xolepepilobixelito.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b002ee8eb4e---vifapu.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/zetixonudeviliwobotidip.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8eaf5d039---luwogitodeboliresosa.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/xewadabob.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/16225159017.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/phc7o7b5sbjvas8nan1gm652ip/wivogimugamazuwato.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/41771975338.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/433cefe6cdb94a652f2fd96a2a3742bb/kupegudureragemuxixap.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/36437606385.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/78d8b38b9d79ff0922a788895db6eac4/duxufefixuxiw.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_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 10692 bytes
SHA-256: fef765f22202305bedcf6c41c2656e093e4c14475b6ea3fc18f8019a4ef499f9
font_01_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 18196 bytes
SHA-256: 2646d79207f4ee9a5c2d4f955734a6fa5acc1487eb9fbff8290fdbb9e593c7c8
font_02_sfnt_off000135d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.