Malicious PDF — malware analysis report

Static analysis result for SHA-256 7564cc86ee97183c…

MALICIOUS

PDF

90.3 KB Created: 2021-09-18 10:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4cf19cb70ec11b8baae7a05ba01b8ac SHA-1: 7592846a6ed44c4db5e14473b61ea6086621b8e1 SHA-256: 7564cc86ee97183cd976c556f4ad8e63fd5d4f76153b849d26c8bc9859776c40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are hosted on disposable domains, indicating a phishing or spamming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious websites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://haisanquangninh.org/data/dulieu/files/86634152847.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431a57298f1---1912568599.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/pabadufunuputoda.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425927b290b---daxagaxugomasotoje.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/lijugoganeter.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/2160284782.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/zixim.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/kadime.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/nelunosefewagor.pdfIn PDF document text
    • http://benetalent.com/upload/files/73221175458.pdfIn PDF document text
    • http://haai.org/upload/file/2462604995.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/lumudutijuw.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ah8qk9rros2lgm41ihdke62ji4/merejasiwizaz.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/50494718440.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f750ef7793962b145d7de51f30e326fe/16632566183.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4d365ae3---14352717146.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/74663083264.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613985eea3445---96137081529.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614152d8ef4b7---49947274680.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/37754538818.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/515aad4fefc317dc4b47487df6f29740/8327071197.pdfIn PDF document text
    • http://arsvet.ru/img/upload/dixozepalajo.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/dizovaxuwudazudamamive.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/zexuwisobop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=beyond+good+and+evil+androidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD080 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_01_sfnt_off0000e65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65F 23176 bytes
SHA-256: 5a7fee83baafd3e29d0d94a4d6e600b392eed0ada142a22c2a3adc11955bd484
font_02_sfnt_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 10392 bytes
SHA-256: a209ef51976a3084a6a47cfaa47f9e47538a7089333349cd1bc5cbcf7d811497
font_03_sfnt_off0001398d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001519a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519A 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105