Malicious PDF — malware analysis report

Static analysis result for SHA-256 037aeed62482bb37…

MALICIOUS

PDF

108.4 KB Created: 2021-06-26 20:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8d6e1bf100a9665e8190325831dde1f4 SHA-1: 1aeb09bb9605e681df196b1b0713bdd4ebc1cca4 SHA-256: 037aeed62482bb37919ebcfa6c7cd6733a99b5996dede04aa98c39abe0754830
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://wastran.ru/uplcv?utm_term=at+the+money+straddle PDF link annotation
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/4852f600fa87f172f9619fca886027b4/87746091607.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/j15krkd97flt4l2n806bcsvre6/64129372294.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/46262775130.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b37bc99de2---tazupavefufot.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff9165c143---peronufavaliluzem.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/fhrnfnucse39jo0f53s78l9du5/nujomiloko.pdfIn PDF document text
    • https://alutat.com/data/file/siwopekutoxajozosoj.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a106c9aa7c1b90b5455b76eb623d53b3/lapavefija.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/f5ucce8ij9eevrvlnpd4rbjv38/1781627480.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/85198568367.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/simoo2r4s1hsr7ecap43ns07l3/62572134152.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b847ffc7627---lubogegupu.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/repalamekurig.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/54768b1aa12435efb9175aba48f206d3/viragebabozije.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/vuwemevo.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d727f5c2f9e---puwerokikezulagevosokapu.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/8e0182baa2d252f5ed2f18b3856624e6/mukesopemuv.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/dcf9b9e305fb3abbb995941e67b355d0/nimedirolakipano.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/gegoreborutop.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4b0bdc8d1---67407486900.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/70792621893.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/27202434668.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/tb16osf3pkeic8t6b0id8picus/gewezinoti.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2212996f77---32118199190.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C8 10516 bytes
SHA-256: b3fd660a5537543c4ffed93a0bda613d9473052d1480faf6bccf43a50965eed6
font_01_sfnt_off0001419b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159AD 19284 bytes
SHA-256: fb27a8f2891c7e2046acb76d852cada75a0c63ff106eddf3e289293d3ddb1f09
font_03_sfnt_off00018bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BC6 16868 bytes
SHA-256: cfa7abc1d10c04d81c03d4e5fd0f371ac7ab980ed7640166fbd055fad9a6059c

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