Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c982ca4e8c3a56a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 13:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7394a6c95085b8d639a93be0acd38bf SHA-1: df442a915f7c0448d62f137f34d879aecbe4bcb5 SHA-256: 2c982ca4e8c3a56a954b3642ad79f2ae23af2cafef172e9d6547ae98e7f2582d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=hill+climbing+2+unlimited+money PDF link annotation
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133217a2c253---89443088338.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aacb7c3a4b---10092678736.pdfIn PDF document text
    • https://carlojans.com/cms/file/futibivozejedazezijosidi.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/kafowozutotepavojivoteri.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021982356267314.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/65635601931.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/panizurumexupupapezoparad.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/76081721340.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/38070147966.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/nokuv.pdfIn PDF document text
    • https://eniedu.com/data/file/20210902172730.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/gutabiwofabuxijosorabe.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/xujesimarada.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/64333118259.pdfIn PDF document text
    • http://ranch.pl/files/file/78027086089.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/peberuwotudetaniv.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/30512969156.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/8hu0s57294bkcn8ocnssil3c2n/bafedopugavove.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/4863550147.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/jijifirasipem.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/sewipunubawajafulol.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/51975249155.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/73362971576.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/peresokupemunow.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_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 17932 bytes
SHA-256: b4c96483adcfd749cfa2c9535ed77bdc042d77c1d48bad8b81e7133830d67e76
font_01_sfnt_off00010991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10991 10748 bytes
SHA-256: 2cee32935eb41544f2cdb050e300a0c17962971ea8257cfccb85c8904b8af5ac
font_02_sfnt_off00012211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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