Malicious PDF — malware analysis report

Static analysis result for SHA-256 887d959efba9d70f…

MALICIOUS

PDF

91.2 KB Created: 2021-09-15 12:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ecf5ccf66245d99e5a19c65c5234951 SHA-1: 9af0f32a5bab5ad198047b31a5bc23b521ed1e7f SHA-256: 887d959efba9d70fe852e0558ac3ffe45a7f7b0b4f4f28d40e38a6f260db6f7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it's a phishing trojan. It contains embedded JavaScript and a link farm pointing to multiple domains, some of which appear to be compromised upload storage. The embedded JavaScript likely facilitates the redirection or download of a secondary payload, contributing to the phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://officeharbor.com/pdtInfo/16399868185.pdf In PDF document text
    • https://niboparis.com/upload/fckeditor/files/wesunetelamajuduru.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/kokibirodonixitugemigugor.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/65373453978.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161315eaf15de0---badomiramu.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/dixokododipurisaja.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac344f0931---82461589141.pdfIn PDF document text
    • http://scsytech.com/upload/files/54354228689.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/84924001824.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/panaxuwunifa.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/14844429865.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/munofatoturafu.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/fawedamezojagogete.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/fofigugokefov.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/10784284054.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/15945276260.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c636700461---monikuzelipare.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161318d5d4db93---fusixokapafasiseguxa.pdfIn PDF document text
    • http://wwsm-us.com/files/file/nuwojikerisexafuxidokita.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/82439601638.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8780076c2---18649223659.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-12/20210912110435594742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=uncontrollably+fond+ep+1+eng+subPDF 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_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 22456 bytes
SHA-256: 8e6e2cd9dc7a62d9acaa34553a2300414a51ac30b316ff0ce7540755b7c9aeb7
font_01_sfnt_off00012d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3E 11116 bytes
SHA-256: b7fe85481d634ea91dd53a921dcdf389b45d18f0ddea355a8afd6db2df814bc3
font_02_sfnt_off00014709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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