Malicious PDF — malware analysis report

Static analysis result for SHA-256 d162b4e8bd2479a3…

MALICIOUS

PDF

83.7 KB Created: 2021-07-14 05:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 700127e71fdffb9cc3bc057ccbbd9227 SHA-1: fe8e67441f7d053b3a542e77dd542f7bdbf0f8da SHA-256: d162b4e8bd2479a3d94493c111c77e74e01680352c56bfc8c644b68957b8115c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress sites, designed to trick users into downloading files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL findings point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16089482560907---kagupofatumigebupigode.pdf
    • http://wwstationery.com/files/file/mafifow.pdf
    • https://almuhja.net/ckfinder/userfiles/files/83682511328.pdf
    • http://axwelindia.com/uploads/tozopumotimujesagegif.pdf
    • http://zh-huaxun.com/uploadfiles/files/97730034132.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/e38091203f2bad707ce71214addf05a8/24317053829.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/75cbf4af073fbd70674d45be2526ce36/wuwibenafuv.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/fca398ad2317930956ee6ec8fb01d5e3/37082910395.pdf
    • http://www.lugashotel.com/data/editorfile/55216701765.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/glni5umg1rn2veke53p7ql56q9/6733513902.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/nrk3qct7s4l0n7q212a06ehscv/25524617536.pdf
    • http://2ds-creations.fr/userfiles/file/xekajetigusozet.pdf
    • http://centrostudiapulia.it/files/files/70810093244.pdf
    • http://huucodatlanh.com/userfiles/file/95892440369.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c569d4625ce---23202048629.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/857842132ebcb713611e57afef4423fb/rigobotozimevaduzivuj.pdf
    • https://pasarantogeldua.com/contents//files/81950400220.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/877a26eeeddcf8a7341f9b74d33aae03/22138644231.pdf
    • https://andana.us/files/files/dixov.pdf
    • https://aronabritcan.com/userfiles/file/debudimuf.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609887d7f34ec---zasalabu.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/gezuri.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/bed6449ee072ca1304420320990873af/borafajexa.pdf
    • http://thankschicken.com/uploads/files/razakizoxaxegonuvasozedi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=difference+between+static+ram+and+dynamic+ram+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 16792 bytes
font_01_sfnt_off0000faf9.bin
f750eb9a928e16a961e6418c97bd4e7c1b7f5fc291dc0519de15bf62928533d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 16524 bytes
font_02_sfnt_off00012614.bin
0b8fb8aba34b41202e94aa60a8b9cd4291c81b9331b1c312220c34228a31ccc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12614 10956 bytes