Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb01fd8067d8a17…

MALICIOUS

PDF

68.2 KB Created: 2021-09-28 00:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 95d0469df819655f04a12578646a4434 SHA-1: 9296850c198ac54f62f192f61d566f44216cecf9 SHA-256: 9fb01fd8067d8a1767a63d82d94c962ce3ee8dcaf222f3b73b4a8f2d913013a1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://laborke.ru/uplcv?utm_term=gta+killer+kip+apk PDF link annotation
    • http://mnarch.it/userfiles/files/vubazewabibazezinega.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210920040152.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/jagasupes.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/0ac007ca4a449feadf80f0dd9ceef2d2/94318137578.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/63f606e31fbf5e4acf0b525c414d15d4/14613370096.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/kalitedokapazax.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/rovizug.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/zajelimapobo.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/68975459239.pdfIn PDF document text
    • http://cib.lin1.ca/phpsites/vertical_living/uploads/file/vofozanaxafatefok.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/muxedu.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/nixosixo.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/68980394216.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/fotilasuxeriwinat.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/gixakujuminex.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/86278341158.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/65c1385c6688ea07bc624a7efeddbc03/23556959943.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/jowelida.pdfIn PDF document text
    • http://hijoin.hu/editor_up/duwizikijigabitug.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/12208152543.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/0d14e7decc98005403ca0b4eabbb53fd/rasukeb.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/57069846488.pdfIn PDF document text
    • http://scsychem.com/upload/files/85030442039.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/79298681545.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_off0000ae55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE55 15396 bytes
SHA-256: bdeeef17dd3486320584be2e5a3c641a2886e18b3bc298abb069341b2ac12c1c
font_01_sfnt_off0000d557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD557 9984 bytes
SHA-256: 98776c52807335ecbd75ba896c969e8a282af0edea335ab38882c736dad59854
font_02_sfnt_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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