Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1704151b966a37f…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 19:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8bc624779f148a0b5d45e95464d7f7c1 SHA-1: 0364b37ef92b591490f05c22ae7056485f1e9aa0 SHA-256: c1704151b966a37f6564e8f6de7179bff90fe984bc686bd20c92d9d579f07f60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The primary attack pattern observed is the use of a link farm to distribute malicious URLs, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://cructi.ru/uplcv?utm_term=quilling+meaning+in+gujarati PDF link annotation
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/612c058d018bcfeddd499e4a9e8317a3/denobusuvuwarobolagu.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/53032795590.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6c8ec272b---65616271525.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/ragonivirosigalu.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/1c5afa28379a200cae1c5973bb4d5307/likagegajuwokusej.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/74016d3ad827933935bae661c198bfcc/88424175428.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/ziludemez.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/fojumomotogupazajunurisi.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fa736f15562---bunudetilobisapiluzugofux.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/xajilegimodinufugetevit.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/80da7b1be399cddf0a824d114e0c9e77/91955736695.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/879052575.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/zuxax.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210507023535634.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4af1f043a---gekodef.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/pipenet.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/fd3ccf542e676c37cc1675fa86adb1a4/74672821826.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/bvs3ispmg063k51th4p4vt4dn5/sevakogibexijejaja.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16112d492d9444---953289957.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/pafikijunidalawaz.pdfIn PDF document text
    • http://chromoink.com/updates/file/sirudojenum.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/mcd0203bjqfg0pk6hp009ftlq3/13607598774.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094ce4c44422---lalebojuxalewoja.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
font_00_sfnt_off0000c817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC817 16784 bytes
SHA-256: 5774dddadf33be7c259e3e7b330d79accf14c800a8c3f3c9454e2338414329d7
font_01_sfnt_off0000e024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83B 10452 bytes
SHA-256: 92c3255be61e1ba31eac84d8bc463576797a2c3356a83732517724d00b35dd32
font_03_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 1908 bytes
SHA-256: e1b34b56f766b52dd7f6f1608e19e75f17ced996a683346d6fdfd66d0a8877c1
font_04_sfnt_off000118b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B2 21616 bytes
SHA-256: d73d6e450da30b3415e6af5fa4c3dac5d44ca6bac6a29d07180e65a3b9c7114d

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