Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5181bf534d76c08…

MALICIOUS

PDF

90.9 KB Created: 2021-09-24 01:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a552dd1c7dfe6f5ef3a1e134d552d488 SHA-1: 7d4e4b45b3766288d7aff69af6e58665ef7127cb SHA-256: d5181bf534d76c08e88dd1da71af9f6fe260f18dddc14145a02d3e56f5ae85f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The use of multiple domains and compromised CMS upload paths points to an effort to evade detection and distribute payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://inwebjor.ru/uplcv?utm_term=a+quite+place+2+free PDF link annotation
    • http://aprt1day.ru/file/86679797355.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/lubezamo.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/lasonajizusavil.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/judabaladoxewitisu.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/92042773349.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/4476963201.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-2/20210902190823768464.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/dapoxufu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cd72c55bf---39033854117.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/puremimawuruse.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/75578024a3ddb3d9d7b436f9878c15cf/14684070599.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-8/20210908034830277118.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/kabewetekuduxosubinof.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/23109007223.pdfIn PDF document text
    • http://wohntraumgmbh.at/95813933099.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/18986994153.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/52550294802.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161304f189f136---zututese.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/bexumikimubumesow.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/pepanalow.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/5730390095.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/vijizezaxonoladofulo.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/23565856318.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161421cacd1b6f---giputojozakoz.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_off00010186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10186 10428 bytes
SHA-256: 4bb24b04b1ec50fc828975beee7643a4590e60904dc793911c900c0011338d23
font_01_sfnt_off00011959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001316b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316B 17360 bytes
SHA-256: a48b2a7771f3e5f1b08890896816bab67539241fc4b9dc4ada3e1a7713e120e2

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