Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6e4ff140f77e90…

MALICIOUS

PDF

75.9 KB Created: 2021-09-13 21:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 518023c46c876c5784d351c42cead766 SHA-1: ab432de8ef3de5417b354fd81d3c38b271b3c94b SHA-256: fc6e4ff140f77e90c78a127f89a2d29c44030ca5f5d5695698e038d6cf2fc0c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=anger+of+stick+5+hack+apk PDF link annotation
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/pg5h37h4t6rald2u8rntev2966/3819848683.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109041117413214.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/39377841365.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/jomewo.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/51048952545.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/zuviduropikadez.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/26360768753.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/7531aa173014025ec5e776d5650398ce/56582188740.pdfIn PDF document text
    • http://punaide.com/userfiles/files/12649597975.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/nijibopela.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/volumumufemetiwevurojakax.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/98764111324.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/migajusigujoxake.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/fogasigamuzogexijojamuj.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/novalenusonelipovaweg.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/wifazawaxezezusilas.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/21459539176.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/8418221550.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/19676983740.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ae209fb14---22036587798.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/30515307717.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/35045501774.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/60054584480.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_off0000bc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC99 10920 bytes
SHA-256: 5b93006d555c42d2b6f0f5190a4019df52c0715b8423bacecf969ab4ad6a9bd9
font_01_sfnt_off0000d5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EF 20512 bytes
SHA-256: 2422329249be21e751ac8289c0ffe4805d1131ff1ab47de5a422d919568c389f
font_02_sfnt_off000109d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1