Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e55e7ce7e2e1032…

MALICIOUS

PDF

125.5 KB Created: 2021-07-13 16:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2b056ce6af913a523e75012b120d5122 SHA-1: 747cfaff13cab79eed575f28d876fc831ce1adca SHA-256: 1e55e7ce7e2e103266eb1c701a202f5338112fc5434b8b1f1b136df051619c1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9743

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://archism.ru/uplcv?utm_term=showing+concern+meaning PDF link annotation
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/38ad228d90698c085bef56d847f80749/9690870920.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/0603766941f99fc2d81f5f1d995092df/50098996009.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffb8a9824c---45071919776.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/b920718639889fe910e41843e31c1f6b/69845972297.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608052fb7f1e4---gudigekojimeveradofobakeb.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b4b4652aa306efb7360efdba87853ddf/nijodoxokuvasazowegovewu.pdfIn PDF document text
    • https://cubic.is/userfiles/file/dofusumu.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/62164906395.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985976e115a---xumekopimurarotepe.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db501be1e4---jotadojekojexumitezubiled.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/1o0gb5uj5iuvqdfu3a0upp84jp/24380675814.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/7ffe4f798e059446019d940c3ed6c38c/bafinalaberujujar.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/9efde4a1edbafedca53e8466e1ccb958/12228735493.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/63b281eb0334d58f8d476ce00f95fe61/bepunamu.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/74b6c8c8a70713b9cb852f25764949a8/51926442362.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/92tf0nm2a284hcv1uoocbrhilk/48746165526.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/32c0de9c76a1e0c1d585029469fbd1aa/22325390258.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c356b8a84---60691132396.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca973c05d7---38974162642.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/pexexezuxutoxiwa.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc4de206a9---wewevotakepivowopojov.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/3ecb5d571f789acf24e82f23b839321f/59801661669.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001b4bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B4BC 27500 bytes
SHA-256: 3dc0b450279db06ff3094ce5b373e506fb00db759b200f71bea7c68608896326
font_00_sfnt_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 10528 bytes
SHA-256: da825ba2aef6da2b82bc5ffdf57378c3269f8b8e27158e13edd75c0a188af40b
font_01_sfnt_off0001385a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385A 7940 bytes
SHA-256: 3e527944b3dff1aa2ad8539e1bbc3c9d2828e79f77aa3348752aea5fc44b3c42
font_02_sfnt_off00015330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15330 31808 bytes
SHA-256: c89cc8a2b5bc92435d305ccbbc3abdac5e08989248eb0827be5088303ed03544
font_03_sfnt_off00019cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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