Malicious PDF — malware analysis report

Static analysis result for SHA-256 716ecec5157abde7…

MALICIOUS

PDF

88.2 KB Created: 2021-08-12 05:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb1655592a95b1598ee9929b96fa0bfd SHA-1: a3794d5cab4c9d9b46c1041954d3f0b55951422d SHA-256: 716ecec5157abde7ae5b41165a09c42459dae8bc1b0e955ba9907b88203afa93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress sites, likely serving as a lure for users to download further malicious content. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16087e61fb6710---24038271179.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3fddf3410---matejelotebufataroxujazi.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/51377208337.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608394ff30341---12514078878.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04a776fa0d---rafopuboz.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7286b85287cad469c84ae9a601bb6cf1/xibasesakajozujekesud.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb466b4365---12271303653.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf494d4a00---zilesopewali.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/24711700143.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d344b076f94e346dde07f36c394e9321/73949206991.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/83941325883.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c61260fb39---naxugor.pdfIn PDF document text
    • http://praguetransfer.com/files/file/fitadunezuzisakulajawe.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/40e2134b2ab39ad440ad44fcd520e478/remulekawenik.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/fijarigudokuvawolidekon.pdfIn PDF document text
    • https://ckmandarin.com/uploads/xubaju.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/razuramitatunuvibub.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210806_055FA639C1BF7E12.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/g10p6q0vaol18upq5qobr16o0n/32963714653.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/kebusoderak.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/jebigesixagusolijokogaw.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/nisuxefimutoguxewipunugol.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/medumapexiriwe.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/21363039157.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/78704079147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+dxcpl+for+windows+7PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F82 16524 bytes
SHA-256: 0c07dfc386792e7c3e1acc37cd474cc360537a81969faecf2bb36cc76b4127b6
font_02_sfnt_off00013a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A00 10620 bytes
SHA-256: 89d2495845824f68633b51668bdcad1f5e6aec6b2fb17fbc55c6c25fbc8dbd91

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