Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b4318097d697e2…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 12:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eed1d8ad69166273ca20442029318756 SHA-1: 6daa4dbbb18d4353d65257b598cc8cc41f944fa1 SHA-256: 19b4318097d697e2ee8e5b4265d27e30ba27366c3461e001e844b3073b1ddd59
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://twfern.org/upload/ckfinder_temp/files/20210620070837.pdf In PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/komuwuvaguri.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aacecc44592---biwakidis.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/68891300091.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/10474032746.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/62mtmuh7t7dqd24vtsaa01pp5l/waleniworitavojeviwetu.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/2c8v76ii3dbpqqh5e0fr62okbo/52191059406.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///84199661710.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/tumujidijabokipitopub.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/9baa8uaa58n6bmo8iq2njelq0e/wemajugodabejufipifipitiz.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/tokon.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d94cfe47---tujamoruji.pdfIn PDF document text
    • http://master-vin.ru/files/file/62955412016.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608581c591e9b---duvevimujisedekapuvuga.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/3aa14f86d2f8d328e3d2045801946015/91227195900.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/1331939235.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/31704134945.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/11813077011.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/42126525555.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vibopegowonigebowapogi.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/nubitiline.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/21679373006.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/8m3rcuarn0pod20ccvumjei46p/sakadab.pdfIn PDF document text
    • https://retta-bg.com/userfiles/62238958483.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/8f5o3khmf2c4btsip48vsfcs68/1190395700.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/telobevorojikirodobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=smonet+wireless+security+camera+system+manualPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/fa9378a0516a9b23936a16062d16b3ac/70915333113.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_off0000e1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 10764 bytes
SHA-256: 37cb0d9b2083e2d6516cfa1b1ee082c73250b9da4260fa7c3a24673fe1530a87
font_01_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BE 17304 bytes
SHA-256: 9082543eea61a1d57cff381238a3c3122d2bc7c331b5d55ab56efc268dc2e454

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