Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3894ce0065d2043…

MALICIOUS

PDF

69.7 KB Created: 2021-09-29 03:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30e6e54698ef3905bc18389ee21e0f59 SHA-1: 57d27f21ba66d68f7c8764d8aaf0bc8594f7f3f3 SHA-256: f3894ce0065d204307ddddaeee51fab53acbf52e0c59a653fa56bf96f8efaa75
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The heuristics indicate it's designed to look like a document but contains numerous links, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=introducing+advanced+macroeconomics+growth+and+business+cycles+2nd+edition+pdf PDF link annotation
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/12767325645.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137eba66ad7b---xegajimar.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/49477390075.pdfIn PDF document text
    • http://abworder.com/uploads/files/40620657663.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614482f1f081c---miluzofobanurilep.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/46593160500.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/18959634838.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/54191782886.pdfIn PDF document text
    • https://motecx.com/images/file/88411353324.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/55562431494.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210922041210.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/30342518303.pdfIn PDF document text
    • http://jonme.net/ckupload/files/39353168890.pdfIn PDF document text
    • https://mbp.hastatis.com/mbp/upload/images/images/upload/ckfinder/88050427522.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/zofobatugapibufa.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/82112636313.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/73514829750.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/13132658528.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/8095463764.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/38097627203.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/84025215924.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/lesisidipeziporuxufura.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a887ef01a0---dimowinotajefafejo.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_off0000b1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B0 11644 bytes
SHA-256: 59fae88f554bc261eed74de357a38d406656c025b8f607488a1e89c84670b4e2
font_01_sfnt_off0000cce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE0 14184 bytes
SHA-256: 346aa2d275b5be66116baa6bef8e65c9a1ebd2afe09dbcd61140462ad82166d0
font_02_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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