Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf77136651cc59f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-03 03:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd6cd6f6fa94c7096b83a9f758663779 SHA-1: a3d437bdfb817a31357b11ee39ff8a2d2a2cdeee SHA-256: 8bf77136651cc59f5c8fbb18b61a195fd85f8465c3c99594b9a0213429695463
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=balancing+chemical+equations+exercises+with+answers+pdf PDF link annotation
    • http://seventyfirstclassof69.com/clients/60772/File/73614252183.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/nufilasuwurodexopixi.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/pi33buq4j82b66pv5uhbt7atj5/wujixararimemotimufofizi.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/4eb629ee933763841c30fbb571a59204/laduxefelodanunuramunexu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d27201fef---50814129131.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/4729750343.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/mogewegazifujex.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607819d5f1212---97779652799.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/bobezusafuke.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/632606188.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/26636446165.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/36c894d2529be49600c7a621b426aa6d/xulebirusigewilesu.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/49b07d1fef5e08ffbf605bac1be5d71f/54468135767.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210814_4E91ABFC1B0FBAEC.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/52544220360.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/48767174957.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1626638898.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/43611061110.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1610681154b7f4---jepivisevuzurun.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/f2f5d0d1b1dfdcd7d584a39d55e74fca/fezusidorirewema.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/misadulokebexiguporu.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/fexanubizutovoponukanatop.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087fea4b45b8---pufuvukidobovaponiwaj.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/gujarimifanepagijibak.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC079 16452 bytes
SHA-256: f4035ae2db84006f92dff51ef2870d61bf892ab4974307884575a5b0c820f8f5
font_01_sfnt_off0000e959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 11552 bytes
SHA-256: 89a707f650f154bb8bf3180dcef57e625e30817aa51c03ae3be0f8a1730770a4

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