Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d43b98ae691d1f7…

MALICIOUS

PDF

71.6 KB Created: 2021-09-29 09:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 93eb2017aea4c099cc52122fb9766d92 SHA-1: 3212db773ddc9fcc15cab7b76dac6c3ea2e6c268 SHA-256: 4d43b98ae691d1f73c42cc108b9ba4e75e8e1cf9e45d4438c17e2377ecb4bbaa
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. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=convert+pdf+to+psd+online PDF link annotation
    • http://obraz-tlt.ru/userfiles/file/88427780244.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16153b79405e78---bivagajutedunupo.pdfIn PDF document text
    • http://annabarons.lv/files/files/14366617095.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6debdc1efbd22128fc5f5a639e59edd4/63009992637.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/37225804515.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/de724b14a91f2ced5f7b6976e5d79ffe/94806866907.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/vumetagenotasovofez.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161380e51d0be2---32684172274.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-8/20210908105313200908.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/womuj.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/xukixunejili.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/tulefewig.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/72849401559.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4b0fcf0be6f177d216bb3fb70e7cae71/tagutabotila.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/79c08da7dc45bb1ae48747afc58d0304/rutidijowutanigunamemeru.pdfIn PDF document text
    • http://jarosi.hu/files/file/74168948780.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/1705027392.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/xazomezal.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149ce188d799---bunakujilud.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/nepawofobepej.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/ruxatuzarizibasekuf.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/rodefutogube.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5bmbks6avdj35frbtjoijpj86l/32559881365.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140a7ae4cfc3---86639409763.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_off0000b342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB59 10424 bytes
SHA-256: 38e5311f934f4cf537a86123ff49a1a76f4631a5261316bcf1ea5d6f1b75c192
font_02_sfnt_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 17700 bytes
SHA-256: 2d19de3527cf121583253f4826c70baa88092a751d14fc93a77573fb3fadc2a9

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