Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fcc3f6728a6251…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 07:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7164c7e6e1948a92e01187faf7cd9a0e SHA-1: 064410f90b17959e92f28f503451a8752ccd23ff SHA-256: 18fcc3f6728a625104d8d0f581ca868fd22ad02bf4867f76b71b4d3954a86f1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains numerous embedded URLs, many of which point to compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The PDF structure itself is identified as a link farm, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://garglob.ru/uplcv?utm_term=most+common+ion+of+potassium PDF link annotation
    • http://dotacjedlaoze.pl/userfiles/file/teriwixa.pdfIn PDF document text
    • https://fultoys.com/userfiles/sikexutixibonitidad.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/37979066188.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/58576581322.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/89842563382.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/86587613608.pdfIn PDF document text
    • https://akemi.ro/hirek/file/44280248317.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/dibotesaxi.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/59647364995.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/20056700704.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126ac80a5abd---gesenipavagumirifov.pdfIn PDF document text
    • http://araonline.hu/uploads/file/dodurezomagixi.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a6ee2dc9e---wavaveduparelazef.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/tigosusuv.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/235f353fbf3cc682166c66bb7dd2e478/nujetebudilugixo.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b134d5d05---84782750826.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/54819938152.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/31172938755.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/vusipujejotogenulikatoli.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16082a9159ae88---78955540531.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b08ea420c3---dotawifanewokone.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/nc3amg3f15k34tidp3in2vie7p/guxevojetivilase.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 17384 bytes
SHA-256: bdf3fee5c042be6158e3b820b3b7d981e217724208b5a98bb243c2c4bb75d8fb
font_02_sfnt_off0001262d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262D 10456 bytes
SHA-256: b436fc498b1aeb2406b8af41e435615e6f7223ea35ee26f2eea5599c36910789

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