Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b621fa7d4a6a220…

MALICIOUS

PDF

89.6 KB Created: 2021-07-23 00:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0cf4beaa3ad864aa149c14cc23f9ad1 SHA-1: fa112c6c089561094cdf0aebd3c8823c44071be6 SHA-256: 3b621fa7d4a6a22079ac798e0fd2059090c55668ee0d132d4ec1ac4770b6a56a
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 as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve to distribute further malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d252018e09---majakoruluk.pdf In PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b86bd01bd4b4c6f52977d40b9538313d/pifafakezuzorumorekonalan.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/ac8e29e8b8c0b03879aaf894cb859e49/10645399996.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/96872759976.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050703134473499.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/777bb39aca1d5d67894cfcd0bf83752a/8755370833.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/zivog.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/lajokulenedisazepu.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/parukewuvuwavoletewuvux.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/runawofusopemifuwerefa.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160de1fe026595---pokorawumuwupixar.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/77322229596.pdfIn PDF document text
    • https://medtek.vn/storage/file/34356304056.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/62866184679.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/bazimife.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/kisabapolorarekasumi.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/fudugotajasiposusupeviku.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a08e61c9d09---zagegosalifoputimegekigeb.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/23038507090.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/74302995052.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609faba561a89---rijowasaretedesodenukez.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/62133122258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=city+of+angels+showPDF 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_off0000f8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 17720 bytes
SHA-256: 311ba8b6751bd9bd709467472f9cf54cc02cb5c3d5a9f37b874bde10c69a8e22
font_01_sfnt_off0001275d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F74 10624 bytes
SHA-256: a89337c4999744f34f208173daea1e1dd604f8f8d25fe806caac55125f53badf

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