Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ca82bcfc813f7d…

MALICIOUS

PDF

86.3 KB Created: 2021-07-02 15:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2a0931f8a58926f6a14d62edf54e08f2 SHA-1: bd0a4fd57e75947f46d313c7fa27737d93a0b0ab SHA-256: e1ca82bcfc813f7dad603001daa574b17655b1b23fec8e9ebf8b210dd1ec10d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://rszm88.com/upfolder/e/files/20210602170255.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a4ab8567---96272460148.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/dasajizovoreti.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hgfr4lj26es2lnt87k0b7o0of2/41590281856.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4aa1731eaf96a0067e6f314ccdc9cf10/19977704192.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210507023019.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c457b6ad7e5---rekulaluniwitibuvuti.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/acf8b1536499202caa8d9d9494180a96/53150227518.pdfIn PDF document text
    • http://liyangah.com/Upload/file/85555452861.pdfIn PDF document text
    • https://avenue102.com/uploads/file/netusidokazofuwuduloro.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/65859957384.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/fdvct6cgbjimq1nt30cgn97rcf/fiberarunoruzejiw.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/64380070654.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/minuraburipi.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/lce0t1hu7kmf7d2as7g1eg5v84/66948146346.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/komibe.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725cf095748---favibuxarel.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa9b6936f6---radorumudarijituja.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/lipidesifogu.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/3cea995249f9352639a6e05a8c5bc639/50813667243.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a71846fe7---70191926010.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/towonufarawiratuvalulob.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/72487985448.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa39d6843b---panubejugezoxelapaxebim.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0321e5d8b6---zupiwipos.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/12079748529.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/af0031f18bee01fd3080de6400ab09b6/riregega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=stimulation+of+the+parasympathetic+nervous+system+would+result+inPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 11328 bytes
SHA-256: afb9a90cdbd05f71cb63d11e4c65068e74ceaf41eae65598e797d32e253583ed
font_02_sfnt_off00011f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F61 16804 bytes
SHA-256: f89ebfebdbbd815e9324b15b986511616d0d54c15b6cc3dfa28db135c6cf20e7

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