Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a882aaecd214b4…

MALICIOUS

PDF

68.2 KB Created: 2021-10-02 18:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 382c6b9fb4b9ccdb91bad82751516a79 SHA-1: c6f6cae95ff1b970224405a7f98f6a96bc3e82b3 SHA-256: 16a882aaecd214b4fe39496f5f6f5b6dbb2b21700d03a66453c84ea715c5cfa5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and heuristics indicate it's an image-based lure. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it's designed to lead the user to a malicious site, likely involving a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9839

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 68 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://chcial.ru/uplcv?utm_term=easy+chicken+entrees PDF link annotation
    • http://progettogeometra.it/userfiles/files/suzuwoma.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/9ne59e3g26m9oih94dmv21clti/falonojupuru.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148b3d5ce046---rejokaven.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/gilisomodaniriruvinaxa.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/bonusagemenusonebip.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/zuwikuguf.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/41384698780.pdfIn PDF document text
    • https://edgecs.com/documents/vadipame.pdfIn PDF document text
    • http://www.andreapondika.cz/file/pezusa.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/31950714233.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/73956947872.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/62572241577.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/724816927.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/93576340437.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/10198322741.pdfIn PDF document text
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/5289242040.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16155fa8dad242---ruraza.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/69088347825.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/94f329985c01f86b4bf5098a5ef36142/39949556027.pdfIn PDF document text
    • http://slsnn.ru/content/files/mufumosifelosojosituleb.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/25053719628.pdfIn PDF document text
    • https://majubesar.org/contents/files/muturexixab.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/fokitelume.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/fedekafunozifon.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/21041452644.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a52a60ba4---48917117164.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/warilawidaxi.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_off0000b1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D7 13824 bytes
SHA-256: c0749ba5354de18e5060aa1dbedd709a569a48012e4022bbe283c66cfa6a18cc
font_02_sfnt_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 10352 bytes
SHA-256: c1edfece02d2fea20530465aa01feb3717a948ac5910a533f5a7575cf5b69ad6

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