Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7dd2c0a355e07a…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 07:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 070c3783906e0806f9e2f37a026da2d6 SHA-1: bfcdb4dd592a02c947952ba9479cb602ee67b81d SHA-256: 9d7dd2c0a355e07aff47494022efd5dd3eb7149cdf91cddd57f9053ed28b6c04
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be hosted on compromised WordPress installations. The ML classifier strongly indicated maliciousness, and the heuristics suggest this PDF is part of a link farm designed to direct traffic to these compromised sites. No scripts were extracted, but the structure and URL patterns are indicative of SEO spam or a redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://chcial.ru/uplcv?utm_term=introducing+yourself+worksheets+pdf PDF link annotation
    • http://www.stemcellhairclinic.com/files/files/47318063069.pdfIn PDF document text
    • https://soechi.net/userfiles/file/waruwesatirukuferejemotez.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160850af1a008c---zubatomojab.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/44631349660.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/41890683921.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/banobukaxugujibogamege.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/sefugon.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c2ad25178---zitumodugozupit.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/jufajowabikerevug.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/vizemeketoluxefalizojexu.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/95576264721.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/pusil.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a82fbf37a9e---fofafi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090efc4379c7---56902785162.pdfIn PDF document text
    • https://tipresentoio.it/images/file/xegaduvadomewonerikajori.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/90626400275.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/xitisabesigixezu.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eca1f86746---xejus.pdfPDF link annotation
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607e748317beb---19825781901.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/losomabafazabofeg.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/huansjsi15ns4afgkscqmfc8lb/28663495586.pdfIn PDF document text
    • https://emmaushuis.org/pages/lobif.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc38800118e---59848295524.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/20973244447.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/be2560c321ad02b3c3a693cbd228ca70/webuxurawazibifanixof.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/xameloluguv.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/a519fa6c6d9be4cdd65b2d5f616e0682/pafalemukefovesinatipeje.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_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10045 18532 bytes
SHA-256: d5664c1081475a57513b8d7f96070d92fec0734c35e46d426ae4060cdc0e5b56
font_02_sfnt_off0001302c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302C 11080 bytes
SHA-256: a4c7b3d0e49dd8878cbf40aa073ce82e922e6c453d9466a13816fa2f9a2e5bfb

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