Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b96ac0ca3a2644…

MALICIOUS

PDF

105.1 KB Created: 2021-05-27 17:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 06d551a0834d06fb346feb8e1333a9cf SHA-1: 82b072883b2eb1f94315ea798e0da1c2e4a7ca02 SHA-256: 18b96ac0ca3a2644dbceabfd99ee760f5b1ab348837394de9d4ab40f18177bf4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a raw IP address in one of the URIs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=terraform+data+aws_vpn_gateway PDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4a9b464c9f44fc749a868ed4d2e2252d/jojat.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/27489bdda717eff52dc7227c995ac338/4643018674.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16090c52edfd9f---51372572335.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d43917103e---dibepezaxagu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/oqfqov0dm8uif4rigt7a1qvls4/xolijizik.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/tepuredapudisedoviza.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/310995a6d976267a909a664611e4f999/notapopinopefoxulisa.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/0c99a4f5a74bcefd13078cbdb939b74c/bajefezuguwepiramuro.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c862d0604c---40978095124.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/xuxirerupomanedupet.pdfPDF link annotation
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8a45a76d18704ba352e5f6420fae9792/71623530715.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/55b0fbcb2db10e1c92193c5063a6ac58/43653519570.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607972eb6859c---23197943164.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160784c3ae607c---kewedubu.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed8d6220df3055e54e0a1c1ae46392c6/mivepazajiruma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C8 6588 bytes
SHA-256: c6acebe3750ab55c09714fa1b34f6c70ddae3ce202e1a088ffcbc34adab53285
font_01_sfnt_off00011a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A42 5300 bytes
SHA-256: e9a1d82820209e03eb65708f2a141877386f828eb56979475799962cd112c620
font_02_sfnt_off00012c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4F 7568 bytes
SHA-256: 6a7fa38773a46a91314d9e023f2bc54ee01b1f4c3b9d743630926a89f271a256
font_03_sfnt_off00014636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14636 12588 bytes
SHA-256: 90549f38212bc3336b4c8a5e8b8905588b10697ec62f0247cc8dce69ad172676
font_04_sfnt_off00017025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17025 16684 bytes
SHA-256: 103dcbd7db9fb747d43c65773742ba7a103c8b5a0850137600f35e31fe43f6a7
font_05_sfnt_off0001868c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1868C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176