Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbb53591633b8d0…

MALICIOUS

PDF

72.7 KB Created: 2021-07-04 12:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71048c3fbda0d6c0dcdeeed3bba58f14 SHA-1: 4608f27fafc87547ef1201a9ff7ca7b750e23998 SHA-256: abbb53591633b8d003f34a379356f80667beed9cec32cfae9025a42efcae4d11
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ludifrance.fr/userfiles/file/31356179258.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160839773a7179---nawuvebewupawesolopugu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3be9755dcc---munuwawewetemavu.pdf
    • http://aldara-latinoamerica.com/userfiles/file/62602951562.pdf
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/sizolale.pdf
    • http://andlupa.com/userfiles/file/fuzaden.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbabf7f4e8---67805778366.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608188e07a280---xupew.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12d5d710ad---dazajukonewozuwokolufugug.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/c07b1jel1f5obi0djrp4eop14k/72716735876.pdf
    • https://hr-serdahel.hu/images/file/jepazowalamojafix.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e36b4b4c---57531878149.pdf
    • http://infinity-pro.ru/userfiles/file/mopufu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3dfd20b20---80526786784.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec53d5ae0b---dibiligakipe.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607703599b9ad---regorabewabizipexotulenod.pdf
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/71882344062.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/664245f606a22bfa4f5f0d4a5b8e8516/96606899877.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/p5rna6jip5nao6gj0t6cd2kdmi/24075794539.pdf
    • http://alphasigmaoverseas.com/userfiles/file/45921147958.pdf
    • https://veterinarycarefoundation.org/userfiles/file/67190849872.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3afc96622---jixoxewijizaroworupa.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/15978728397.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=types+of+empaths+test
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9f7.bin
3f3ace51e712e5c0a8e2735550aaa822313cb24a484d9494752abb646f3ea9bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F7 10356 bytes
font_01_sfnt_off0000d178.bin
299f72e33a4263053abd6844575b8ee0e3ffa20bbcdfb8ca6b991d96dacbe1c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD178 16496 bytes
font_02_sfnt_off0000fc06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 16792 bytes