Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94a7922d1eabecf…

MALICIOUS

PDF

83.7 KB Created: 2021-09-21 05:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0f142dac1dcb8296dfccd50920da21a SHA-1: e4bb9004d6037050aea77b30707b952f2e21acd8 SHA-256: b94a7922d1eabecf8c6efbee75e759d6e45209038ccf7786bd905061fe0aa8e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=target+apk+download PDF link annotation
    • http://12shio5.com/contents/files/52653455203.pdfIn PDF document text
    • http://inistor.com/ufiles/files/43224422209.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/762e4697c1e2e38fed312327a2823c95/sopilutunojupo.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/gozibipalidobazow.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/81261752983.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/wusidokaxoto.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109132248096461.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/10213457646.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/21270186845.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/52369702392.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/44622102801.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/75238503691.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b78e5f440---75154435824.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/55479791236.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614313d0372d0---jaxubilaruvo.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c1588c8fc7de8434d295f3d4140f483c/1304439832.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/tapubi.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/16564980055.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143de012397d---89728898537.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/90udlavu0sq288o0jvvlg4106t/51233159924.pdfIn PDF document text
    • http://cy2hand.com/userfiles/fokuko.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/23315469222.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3b04a50e097f3176a96e67c5c262310d/lutaruwomerukosa.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/zigopidojadorovum.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/tuxobokuzisafakujutuxut.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/40634471457.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/62052387077.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_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 10448 bytes
SHA-256: 660c95ed8c63ce65bb9d8911603a32af1d4511a3144ed18411e84dc0ff730a68
font_01_sfnt_off0000fa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1F 18176 bytes
SHA-256: 032c9beb10d14acc578e3883b33741a93bee0986464e66e98856d71adc69e895
font_02_sfnt_off00012918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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