Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97da652e9c07f54…

MALICIOUS

PDF

83.3 KB Created: 2021-08-17 16:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e7c7f6c8b1e93d3d0a800870be373eb SHA-1: c8b05fee8d5adf4714017f36c4f2436fcddab03d SHA-256: e97da652e9c07f5413f0c8f1e932378f92023f33bcb6418b2fd31aeb9497ad4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to mislead users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO spam. Although no scripts were directly extracted, the structure and URL patterns are indicative of a malicious document, potentially leveraging JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=how+do+you+check+a+phone+number+for+free PDF link annotation
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f5fb2eabb9c7fec6769ad65d714e3b76/3688379276.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/8297606900.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/lovobumawipuvi.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/24494509875.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/22250871678.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/41985232153.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1fu0r8i1i2hmbt2drr5h9u9jr3/tasekujemoxabilosefeba.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/f3k4vq9ema502rhur6a3a61o6p/93890116278.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles//files/lonewaxixuzojogefazetig.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/sirofanaxosuxukejoxeje.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e80ad3a1a---80626846283.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/31677262576.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/48234297397.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/43569083587.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161196bb9bdd5b---pusosokaka.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100a4d93ea71---tudiravopebisuvigeze.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/90320120949.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/rirepademizanamexivavula.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/37193888827.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/19995371955.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/3561628757.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/lufukeginikesibupexirajos.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/27151799714.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_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF801 11004 bytes
SHA-256: 8cc43e2edf375f083f2adf934b796a5587389ddf4c370b48ee9fd732b2f1b403
font_02_sfnt_off0001112b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112B 17228 bytes
SHA-256: 4b12347c00d9cf05e89c2b53ac147d5a776dd6799eefe38abd5fecc4a0db8542

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