Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab70d0d36d3a2b83…

MALICIOUS

PDF

67.7 KB Created: 2021-10-01 23:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 32cfbb52bb779472c2c87d834833b03b SHA-1: 4ccca357e53a4b8795276e4dbd97b0a64fcb8590 SHA-256: ab70d0d36d3a2b832b772025c2809943a385c3541f8ecabc74a2d9eac2dd7092
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads. The primary function appears to be redirecting users through a series of links, likely to a phishing page or to download a second-stage payload. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://elard-group.com/ckfinder/userfiles/files/biwatixuxitiri.pdf In PDF document text
    • https://villamishkan.com/310renonew/front/images/files/70819989659.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210914035353.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e304c9237---11434852515.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/92185368952.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/56562289987.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/90269989603.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161498c0b9f1e2---fekewelajib.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301f283b8df---32281027985.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5b143ac6cfc27dec767b7383101e0a9d/rabare.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6e432acfa---44994856934.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/netal.pdfIn PDF document text
    • https://combrooncom.com/contents/files/17161686040.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210925_080104.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/35953680256.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/79446532752.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/xekimamumegafojolipe.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161397e752da9a---fixoxuxamevazoguruxoja.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/61811581712.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/10695569859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=youtube+2016+apkPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/nuwikufogojanivafomuzarob.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_off0000acbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CF 14752 bytes
SHA-256: 79861065ed6a10e210a83949cc6f5dc7b5c433774b5bf0584814ad7429ced4d7
font_02_sfnt_off0000e9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F2 10512 bytes
SHA-256: 99ff5cd2fd9726313f809b3bc4158fc87cd1a60169ffc1d9d7cdf0d5317ae873

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