Malicious PDF — malware analysis report

Static analysis result for SHA-256 8818552543ff6ab3…

MALICIOUS

PDF

85.1 KB Created: 2021-08-28 12:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 23c1b1d4887a734dac0da48c985db49b SHA-1: de31f1f5e43a6b912d33213f8675f36dffa38f37 SHA-256: 8818552543ff6ab3efa215ea6d91767e3554df85782252da650aca271e88b29c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of these links and the overall detection indicate an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=new+bollywood+movies+download+2020+filmywap PDF link annotation
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/0b699ff988abe5ee496a31bf6305dec6/durube.pdfIn PDF document text
    • https://chp-travel.ir/data/file/bumavedibejixopuje.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9d80c7eb8f8da5be8f747a1b2a7d9be0/50935565080.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aae5144a1c4---lafedusadigoma.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/14890120767.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/3842598147.pdfIn PDF document text
    • http://northcity.rs/slike/files/gavez.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/lekenokufigobo.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/99282295550.pdfIn PDF document text
    • https://bczenekar.hu/files/file/87376970554.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/10480262554.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/wuleru.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/pt0o3em1s5qgtq1qj1p8eiukc0/22252805548.pdfIn PDF document text
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/sereredofojasixil.pdfIn PDF document text
    • http://mobitransjogja.com/files/5957050588.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/71640916203.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/939905241f7731350d70da9028ae571e/lagebozawovisemogi.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/v8q07tvl8qd7mim320bf8tkbrv/rovodatemeluxarixuxujini.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/75253980503.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/ee0ee92266bf62506f796701a56e7bf3/42726719167.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/15825734830.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/kumuzetevidinizukabof.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/52eiqle2k4o8hgupae9b7q3obv/68873855061.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129474b3cfdc---76655138845.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_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 17896 bytes
SHA-256: 961eb00dc42361a64771a921cb60f7e47c5fac4f9a747bb1d39c21bcd4c6a0bd
font_01_sfnt_off000114b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC9 11088 bytes
SHA-256: 34e403cc583ebbe537cc21a8c5fd7f19f6fba99c06b160b6bab62afde92809a5

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