Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22c29ce7cc78d52…

MALICIOUS

PDF

85.3 KB Created: 2021-07-01 00:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d6d6420c9f51abdcacaa90b48051785f SHA-1: 28d366420ef05e655713db0796bb3fed7dec9cee SHA-256: a22c29ce7cc78d52303c5aa9c6c1fb02015be43f71247ce7c54f306fce9f690b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary function appears to be redirecting users through these links, potentially to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://botosani.ro/img/uploads/file/piroganudaxidawupitozozuk.pdf In PDF document text
    • http://asiavent.com/UserFiles/file///valepa.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/4774b83a0c6ea72932b3e89cae15d218/16147341980.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ae5fa0a40---52392796786.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084a6024e419---nakajuwujaroximi.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/504e7178230bbfcaaba319984a57078f/2940147287.pdfIn PDF document text
    • https://tonitomov.com/picture/file/bibafalus.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/d7h2nd4173tcphmfc92idedb61/14183630256.pdfIn PDF document text
    • http://stavbyhes.cz/ckfinder/userfiles/files/kuboluwolomub.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/00e53a84838550bda0add86b10e65f4f/50032516924.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/46192045019.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/bejokivi.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/hsb1c00qsc4qlb6nvs3kjls3t2/tazixinapifimemodo.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/subakomemupelimeneram.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/naramofonubudare.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a590a3b5041---89498670330.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7f5415af---vulemirerodozatavikunelig.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/78022600823.pdfIn PDF document text
    • http://uci.ir/userfiles/file/95705301589.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eacf2cfa2---tujuvukasezo.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/f7jcl4o2d5l4mbdtrj4qu9kbh6/fizodena.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa4ef7a90f---69181704535.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fea371cf8---tiduzefalo.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/68459904326.pdfIn PDF document text
    • http://barksdalereunions.com/clients/869108/File/57534107506.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/69376358151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=function+of+mesosomesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D7 16656 bytes
SHA-256: 2af8b2476b0ab99b2ef606ee67dcf482ccb51980ed4d03c9dd53d83a42f59604
font_01_sfnt_off00010120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 10264 bytes
SHA-256: 2324a7550e61a9083aa6ab0168040b0c3fcf802f3284526c9460d5a2b661bc88
font_02_sfnt_off0001183a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001304b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304B 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4

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