Malicious PDF — malware analysis report

Static analysis result for SHA-256 45736c55f54ea8a1…

MALICIOUS

PDF

91.3 KB Created: 2021-08-19 08:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f3e0ad21aac2aa281fe7d647e54dbbd SHA-1: 04efef5d8e1782b842350768b8d25f66f248dea3 SHA-256: 45736c55f54ea8a10e357819bb3c1737fb652f367b4206999a69e1542d5c0c14
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of numerous external URIs and the use of disposable hosting suggest an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d72c0e130fc39602766983289cb29d59/xupopakepamusivurazumobud.pdf In PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16095a30bad697---56086186320.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160906e32761ef---bivebofux.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0db5e0a439---kagekoluvizebu.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/xiredevitixujeribuk.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/juzavugizib.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/99660513884.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/62c1b87796e2ea27069ca57d5c8f5a33/7702422849.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/10956914129.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/mukowol.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/13930714275.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/wexodimetig.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23c7c569d.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d149fafda0---wuditinalemelo.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/483171c4b2e42dd3d74cc5819e23fae0/pozadadugonizalosixoneki.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7b2703f50500d686d10af1c655893fb2/vaniwevisoviket.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/70138740638.pdfIn PDF document text
    • https://denimder.org/resimler/files/55872580965.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/5a65402716ecabe57f08eb136e5dad0e/bokifukesobazu.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/45058093575.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16118d0f3d28fd---61786944111.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ed221e08ed---funixuloged.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/vuwisunumapifulirolevogov.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/tizarujajotivozit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=central+dogma+transcription+worksheet+answersPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 11172 bytes
SHA-256: b51512028598fa41499ef932d00aa29e8c9830306f22b0a68517600d96d4a8f3
font_02_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 17412 bytes
SHA-256: c011a5fa5126c4dabe09cf1820a39192119e620ae92c62f205b6b63bf33c1fc0
font_03_sfnt_off00012e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E94 18576 bytes
SHA-256: 48161d044a94a7268ea8ab1f532fe76bd43ac151f0358d9ab426c2da0cc7f4ac

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