Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5e29f91b84a613…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 11:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 440f3722ee94166e0ccf0f5f9200da7b SHA-1: 752c6cccdbef9226f26f79bc3af54d80eaacfc90 SHA-256: 4a5e29f91b84a6138270fa3d28e8e0d43a1914635d9a499f75bce08f101b4db3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs and link farms pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=dawn+of+zombie+hack PDF link annotation
    • http://summitremodelinginc.com/userfiles/files/3887939882.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210912_1DE0ED946BEB785B.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371b535e8f0---50801738388.pdfIn PDF document text
    • http://gaudi.tw/upload/file/4180876993.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/54798070851.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/bawudakafovalenikapepab.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613284f88a3d5---diwoj.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210917073839.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/sitopozipavofivawaravi.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/95621004223.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/masagarukuninimuvide.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/46920731621.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/lulufuragimufuvu.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444e9274bf6---55775353215.pdfIn PDF document text
    • http://elskenecologie.nl/files/18493815661.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/44614263953.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/vajotituveganiputewejapab.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/xawatiwagitunepararevam.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/32099589548.pdfIn PDF document text
    • https://granitnet.hu/editor_up/susevup.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/88004990512.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/53809025057.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/dbb47708b52d9152d3d1dc0b73413b01/wamupikepivasukitebavobew.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_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 17592 bytes
SHA-256: f04d5671c6fd13fe8254ba7c922cb6bca35229f370396e13464519e7570612de
font_01_sfnt_off00011a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13258 10568 bytes
SHA-256: aa9a538caecc3cef2ca06e65794332926c1d859212db1367a00b1332e32ad34c