Malicious PDF — malware analysis report

Static analysis result for SHA-256 0915d1d71aeb7f2a…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 10:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5d8967ccfe2b3384d0564291441772a SHA-1: e0b8fd0e569675cb4d63177d0ff532bd24cab5f5 SHA-256: 0915d1d71aeb7f2aca596b5ea7c559469fd69ebbcee97c292a7b742bb4cbf628
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to download other PDFs from compromised CMS uploads and disposable hosting domains. While no scripts were directly extracted, the nature of the links suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://colescastle.com/clients/875019/File/41255627545.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/21714834695.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160877a4d8745e---nuzitevagusenebebo.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a10bebbe1a9159cc583c61a9dfc2fc58/fakakulejimemixige.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf02a26ecd---tunojotoka.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2938fabb8a---93794378676.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2972eb60fa---xitipawadij.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc0d061ee---11886217425.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e673381a6---gepekopozunigojogigipedu.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1hvg43vgli96r02e6esek06fj3/naxegemisopag.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ghq2vep74i7vtsr8368gltp3i0/goxosixozidadalesasi.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9957a5448---40748717363.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bebe94778c2---33730189528.pdf
    • http://tubietelbar.hu/uploadfile/57298225170.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b98970b487---veregajikabexoda.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083513f78264---wevovomudusidude.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/mjdhoht86jhl6ffra5ps6cqdbe/kixuxiwoguwigososut.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/wowuvopegefonanerosexor.pdf
    • https://winpoasia.com/ckfinder/userfiles/files/buzuvixer.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc0ce24dd651a48bee174834997f756f/tobulewinokiledukelu.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/583d13bda025b06c93220153d7459d15/83392250354.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/zefivipaxemunipegik.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be7ed37f936---zelakatatebapem.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/04fa87528d2ea13a62b4a78012ce6f2f/fofamaxavorasusisadijeja.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=addition+and+subtraction+of+algebraic+expressions+worksheets+grade+7
    • 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_off0000ef20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 16792 bytes
font_01_sfnt_off00010732.bin
a967aef878dc8b800c52161f7fb2232605c2cb6895b1fda387ff2c1ec715358e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 16892 bytes
font_02_sfnt_off00013329.bin
48e552ae8e6c1f4fca8dc01fc2d9fb83e29fd9a7f7610d7e4650f3e2351c9b4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13329 11452 bytes

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