Malicious PDF — malware analysis report

Static analysis result for SHA-256 999ce0db87ea822a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 13:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30278b7b4e30c30f38e2bd0676e8e27e SHA-1: 4cfaee97d3a0fe5ee4089908039eb0dfe32c1e05 SHA-256: 999ce0db87ea822a32121429ce19a2dc2ff51a8bd099e6be7cc9252027e01ecf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=a+christmas+memory+pdf+truman+capote PDF link annotation
    • http://medicaldistri.com/ckfinder_files/files/kilaseripomimumogegi.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/88204061738.pdfIn PDF document text
    • http://soupworld.de/upload/file/82500442633.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/48590445516.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/60b9b1b3b07e0b27d820e1a36a84e089/491609059.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf6dad8ffb---gusalijena.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/vekew.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/15885499239.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/jilaveretikufugozufabuzo.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/73932909590.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/c50c6d947821ba7857de69b8f09aa8a5/tutelo.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/13880044956.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/b0866ce01fca63d1e9a9e61230b490e0/47266885153.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/beviwizivodene.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3c579986d---tetadaliwegexawimewitel.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/kagaxuzuzenitu.pdfIn PDF document text
    • https://room12shio4.com/contents//files/famezakatosazetibugewabon.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072da7f869e5---74120541347.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/537c626fc8c472be18efa2cce9f3cd5e/87303518400.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6bbdb8b77c8f134dcdce1c0512def6fd/13447572038.pdfIn PDF document text
    • http://co-mit.com/uploads/files/26065258798.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/31895799969.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/bavarez.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/850a470ea7b6d89b2f2d03ac57add214/fuveruxe.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/deliradamesomajajufu.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_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 11032 bytes
SHA-256: 4478242d827acded7ea8fe62f1a01b43a910e743da8005749fef0d4600d8b684
font_02_sfnt_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 18360 bytes
SHA-256: 5062fd5a1b0c800c95f39672a3ba56ba518bf9160f731db2f9844509e3611ff2

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