Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff28a227623f3ae…

MALICIOUS

PDF

82.4 KB Created: 2021-09-23 19:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f973657ed00424ff7cddca11bbac0bf6 SHA-1: 25ebc28479e829f25e72a63aecd509b9c092cee1 SHA-256: cff28a227623f3aedb8dc36ad01689bc85738a2f49f9bf0423b4a8eb2944a19a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple heuristics related to PDF link farms and external URIs, coupled with a 'Download Button' lure, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated, but the overall structure and URL patterns point towards a campaign distributing malicious PDFs that likely redirect users to compromised websites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=after+we+collided+full+movie+download+free+without+signing+up PDF link annotation
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3350c3060---gulilar.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/20270203180.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/tojigugowufinabofulin.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/3755160148.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/81876806848.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/42311505357.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109022233184118.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/pirof.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/92518429452.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf12c81c7a---natulumur.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/45093273837.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/93034421254.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/konugadipopolosiforipi.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/94834878846.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/ropofo.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400ec3192b9---fesajesapuvepuz.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210920021107.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/ditutarupoxidewomikimo.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/nifuxima.pdfIn PDF document text
    • https://scalping.ir/data/files/file/nagexelesovaginu.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/dekavumuniwalokozolejimul.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/75416370851.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/ratemagetejudaxesuwalajuv.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/runejibefawapetogegamim.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/59f75e79acc56f20918e881eb2aea182/sodotipibato.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_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 17140 bytes
SHA-256: 0c95df6d50a18e57232f8ad0b31a25f9d9603166cd8c699e6ec2b86f2475cb57
font_01_sfnt_off000108e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12100 11300 bytes
SHA-256: 61c8a951406d001f6dfef351267385128dc832acf4cb9a440a688d4fb990a7e7

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