Malicious PDF — malware analysis report

Static analysis result for SHA-256 8401b88b0a8f5f35…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 01:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d2ebdf6233a7eda7fe81be9eff13eac SHA-1: 4f465af7997d171abde8f12897b58a291bdfcde6 SHA-256: 8401b88b0a8f5f35670ce1a34f77c58fbcb4b5a22328b9e9a73f13617a5811b1
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=best+anime+games+on+ios PDF link annotation
    • http://bong-dem-long.org/upload/editor/files/maxufivuvavibaximawove.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/76863513522.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejozigesisukip.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/69793574730.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/mubaxugaxovogedimi.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/2gu7usedpmrq1agnt9j67mtknd/14104399276.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/fupiwegu.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/tavusabilotovawagu.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/dopidozodutanijokoxiwefar.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/91157487022.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/gipofowi.pdfIn PDF document text
    • https://windscrm.net/files/file/39589354143.pdfIn PDF document text
    • http://podushka.by/files/files/13520094666.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/33106421307.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/finuxexeparewivarorise.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/61522646997.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/08ecc7f6bbaf04dcc3206cd3fead701a/pogibi.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5slk8hdluhpu03re1novihff8b/5300741149.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/11511731178.pdfIn PDF document text
    • https://atiksigorta.com/files/gugizarojovo.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/15323029418.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141d2c54b98d---menotuzajonirelewaru.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/29153888796.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e54f2a07bf520b0e2972ed4dbbb2513d/wutewujifobufilibanipep.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_off0000ce52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE52 16756 bytes
SHA-256: 5f2741fc24f6130047012e15974a4fe922a3b10d9dde0c9d904a8a607da4b736
font_01_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B0 10360 bytes
SHA-256: 6eabb48533414f6eabe78380daadd99f6c98079f32c8826d541dc0e913de4fe8

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