Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a1fe1a9cb8d0d0…

MALICIOUS

PDF

89.0 KB Created: 2021-07-04 06:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ec54c681bc75f04d826f053c872fbb00 SHA-1: 5c92d8c1949df99f009cc704ba70af8ee0fdd1f4 SHA-256: 57a1fe1a9cb8d0d0696d7db953735034a4e39fecf93eb5ec15aa681f904f6b2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://imhkayseri.com/resimler/files/41681145039.pdf In PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d6edc04cf---veditosukapawasepuruwaj.pdfIn PDF document text
    • https://esz.jp/img/editor/files/45847999775.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087bf4da9d57---disegogijolalawasox.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f5929f6ce---40140377851.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/gifaxaluwogimedufuma.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/13c18396446c4351973607dbe35b4cb9/zabafemekunuxet.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1f18db42cb108939e1c6a6179bf8bdba/mazulosokan.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/50760430324.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/4478889016.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/gufotajanekez.pdfIn PDF document text
    • https://anfauglir.com/images/file/gusiziradejobofaz.pdfIn PDF document text
    • http://yilip.net/userData/board/file/22368547818.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/a4834b19076298daf0afda14b811670d/lapuroki.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75e405293---33774035630.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/dgbfqaaof053fol1ablkqffblv/rawetelomulisorofelaro.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210604044435.pdfIn PDF document text
    • https://bhavalaya.org/ckfinder/userfiles/files/83974893736.pdfIn PDF document text
    • http://martonelektro.hu/files/file/45486965082.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/97198708136.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/72a06903b7902ffc66b844486569807e/literavukezaxusanulesoza.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815b5662dc3---luwolenilo.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a973ec3878---67464901545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=multiple+choice+questions+on+finite+element+analysisPDF link annotation
    • https://mediaget.com/userfiles/files/dikatusoweribarakezuwadog.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_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB0 18228 bytes
SHA-256: ce5c1c6f05040e6af93f31b13545a417f4640eec8c1b955e2c5a3b801d619743
font_02_sfnt_off00013b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2A 10996 bytes
SHA-256: a95f4406855cc9779e1a37734227565e777fe5049a7357cfcd3ff9cbfc59ab97

Open this report in the interactive analyzer, or submit your own file for analysis.