Malicious PDF — malware analysis report

Static analysis result for SHA-256 871541d23a0bab75…

MALICIOUS

PDF

87.6 KB Created: 2021-06-29 00:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1a72004494966bf144fd4fd87a0470c3 SHA-1: b8a134bffb2e9609a1d0f5438f389904822bdb68 SHA-256: 871541d23a0bab7577d65e566a002002eafe09fe4f30c4d5c0e04a52e18b36a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting vulnerabilities or directing users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://actor-conseil.com/files/file/mekopojap.pdf In PDF document text
    • http://pogservice.ru/userfiles/file/mepopepipivorurekumaxet.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d140ba0d8eeff48d6669b69b0a46e443/94020833375.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/lsutji826agp215flofobr1skc/gugibofipojejubulafel.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6299e14749---33576107476.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/vewukimuvivapapolepejifi.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/movonim.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef75775e9---97773612197.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097120b8383a---89797448429.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/fesolatefowerig.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/shtj82q93l58jcil39t529h1gi/tegazedapasajuto.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/g6p9mdodig1evii2k1cfv3v933/fazero.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2937ee74a3---waleba.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/nujolizikowizusetopumimif.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/getnilpo0ml12d9vkg8giuik8u/96999494790.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/46593993796.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fac58940e4---76328667063.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/b9mpln3hvaei72u2rk48s7i03b/xixabadivarifebubo.pdfIn PDF document text
    • https://spacio.hk/attachment/file/58497204279.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074798103e91---zuwuputad.pdfIn PDF document text
    • http://www.emailposte.com/pictures/puboxumivusowubujex.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/bc7c4a66399c61cad52901f551ab28a1/30837421745.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/famirikajenunotedusew.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/xitogido.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/907ka5o0hrbkecr556rg5mdjm4/22987947016.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a71582a8c24873b1960c44f0591fb74f/44654252034.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/61735993252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+many+babies+can+a+rabbit+have+in+one+yearPDF 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_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 10848 bytes
SHA-256: 7598354904525b08a6975f0874534f516f042fdc5b2ff569fc939546234ebf37
font_01_sfnt_off00010ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CED 16696 bytes
SHA-256: 615193202ca8a9ce112877476e2240df306b4688615e7234ef00fa9ea7fe7da2
font_02_sfnt_off00013866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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