Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfa83cbb507035b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-01 00:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: efdac22400e3313398d2c1a1526825dd SHA-1: 2fe03c6454f35cb9fd8195530e4f4e7710800271 SHA-256: ecfa83cbb507035bdbd35f6e8e8673fab0ba4ef30f5d28e5efaa095e9345d88f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-only interface with embedded links pointing to compromised CMS upload directories, suggesting an attempt to trick users into downloading further malicious content or visiting a phishing site. The document body is heavily obfuscated and unreadable, providing no direct textual clues but reinforcing the likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 70 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 http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160820cedebc30---80706651003.pdf In PDF document text
    • https://cesiedizioni.com/userfiles/file/52028142396.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16084a39bc1ee5---toreribobokodi.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/tojazowo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/70de9396a151f2af97b00e7d35cd8924/63039867916.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/hse5f2bctcgvuibeadm2nk2v53/19166025071.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/18674758365.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/69603335734.pdfIn PDF document text
    • https://triosms.com/userfiles/file/6404606332.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/ejvq8usb5d2vc4bjpqkg855vs4/80624122506.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da78c84132---sodatafosafedifezatepe.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/af475694da1d4356cae3b0eb48b576a8/sibetexevinalinusilum.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/96283207516.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/13071460066.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/bupalajopabekaturore.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/xadonito.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad00a339da2---66735183772.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/68979939717.pdfIn PDF document text
    • http://it-hair.com/userfiles/fonitabezovavuxofususi.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/mesonag.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1e99787d9---bewexotazorutifuxaj.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/bezenavaxerikizelidak.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/94808192582.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/84528368365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=homeotic+gene+expressionPDF link annotation
    • 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_off0000b7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CC 10600 bytes
SHA-256: 14c83514d25195a4b928685c79eda16e11c99299c773307e3f22f283abca70dc
font_01_sfnt_off0000cff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF0 14008 bytes
SHA-256: 8bf13656368bdac8751c1aab9f43cc1801ea3c13b06f21f123a76e5f54a6ba4b
font_02_sfnt_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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