Malicious PDF — malware analysis report

Static analysis result for SHA-256 2313f49f987802ac…

MALICIOUS

PDF

84.9 KB Created: 2021-07-03 12:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c83ed13ea1346e2bd7fcb27bc0fd526b SHA-1: c7bf08edc3c7b17a29f037fe90d54fe49e30e647 SHA-256: 2313f49f987802ac8730623d005fdfcc74371ac84d0397ef93463d252145a7a5
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised upload links and SEO-focused disposable domains points towards an effort to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://synerhu.ru/uplcv?utm_term=cyber+security+analyst+salary PDF link annotation
    • https://vnsteeldetailing.com/UserFiles/files/dewiwuduvug.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/73840904643.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb86e661bf---virajunorokasewegegiwo.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/98549737759.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/e613b90gm3ci9l7kila6du7f0j/tuxigarinemoj.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080baee60297---84357123146.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/24729064189.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/296c8a0b7dd50009143ed8fe49464f12/38552348600.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/zifuze.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/5e8877fdb3a3c6589755151490d0e000/42010811148.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/6db311f271a2d631ecc51c5d7a0492cb/jerawojelew.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/eskjs4sa7j68ls4br0i0q6rt20/10831821126.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/28813316277.pdfIn PDF document text
    • http://abpaluso.com/upload/file/34197666899.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160986352b457b---42705776896.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/piliref.pdfIn PDF document text
    • https://autopratichesas.it/file/95588283017.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/afi61svgsat0famuh7ls49d1pt/zilisovazoxolus.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/pitezamoli.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082180ee698c---26205249970.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8936bf4b1---37451697437.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a752078e77---23780685315.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_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 10488 bytes
SHA-256: 929c64ccd00f9e6a6e8399179d3bb0f335324001b148474685d97e2d6a3d0b96
font_02_sfnt_off00011bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 16412 bytes
SHA-256: cdf48b49c8c36600fedf442dfb4e68401c9f29f01464d95e03aaaf702073d34a

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