Malicious PDF — malware analysis report

Static analysis result for SHA-256 1575afc90d599791…

MALICIOUS

PDF

92.6 KB Created: 2021-07-18 09:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7439f9ecab46118cc32cfc7a69c995be SHA-1: e0bf619d5143ac16fe2204f6697cfd5a75be0369 SHA-256: 1575afc90d5997914e050cf48ed9888a23505c575d6c4c4e3847d9afa4db87ad
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

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://majubesar.com/contents//files/gebewagev.pdf In PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/foperekidipuxipaduwopo.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/391db0372b1f67422eb4f50f3bbca5e1/15410744627.pdfIn PDF document text
    • https://susta.vn/userfiles/file/11717625113.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/malodapefetekari.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/tulipukeno.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/xaxabavin.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/040f9cbf5f316535d2932b973cf9fc75/wedej.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/79131701162.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6670bcf1efe9cf3ccc35e9ef2917acbb/55910850836.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/800d76cd8678651ee9e21bbbe4392a5e/mafizejufajunojuj.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc23cd9192---76102598801.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/55360227571.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ag1ilfgq6doqjeee12vencbq06/32493154301.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/nipogelipadoseranoxiz.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/fedinesavirefojunekabalud.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210630_2B5129255F9F285E.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/66846470418.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/jubidavabapu.pdfIn PDF document text
    • http://atek-ent.com/upload/file/6657305926.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/xinakixirurobag.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/tizeradusulaminolu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3888446b73---savonajiz.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/96427655588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+new+creationismPDF link annotation
    • 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_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 17936 bytes
SHA-256: d327cb713358f440ee93d8ac0949caad85a7a2468d5dfb719ebc3ae9c15f6aa5
font_01_sfnt_off0001356c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356C 10496 bytes
SHA-256: 26d9f83bee0f65ddae589eff7fa531a42091738b259fd8f7cd7b717402727104
font_02_sfnt_off00014d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1