Malicious PDF — malware analysis report

Static analysis result for SHA-256 515ab58f6f77bc33…

MALICIOUS

PDF

84.5 KB Created: 2021-09-11 05:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fdb91038e82bd804edc67123bf13d743 SHA-1: 96a29ffac840f5bf2467c382bc006119b2655e9a SHA-256: 515ab58f6f77bc33ee2686af51fe6e7dbf64b156489006ef921def08b65f0015
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicative of a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

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://drafthe.ru/uplcv?utm_term=cara+membuat+tulisan+keren+di+android PDF link annotation
    • http://forumcutuca.com/ckfinder/userfiles/files/71622638447.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349cbef362c---77794008342.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/gozinuzuke.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/95962300156.pdfIn PDF document text
    • http://bdnchem.com/upload/files/75340703586.pdfIn PDF document text
    • http://belloverde.net/emailer/file/88382793711.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/95542029227.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/xowukinupodituluwekibiju.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/lemovonozasojim.pdfIn PDF document text
    • https://mackbeks.com/files/file/32760935572.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/29561760091.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f49dd574e7---numipozipumajefokinawuwe.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14b13610f---vebabutopoxud.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/lamukuxuwolukubatiwo.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/dawanesenos.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613b181880cdc---woriranomitaxufetega.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210908180014813.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/jawamukejikegogijoviduxop.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/bozujeni.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/47241312543.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139990668cf8---27668745604.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/fuzulutirimotawar.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/42884518066.pdfIn PDF document text
    • https://sitarasign.ir/data/file/3429403079.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/85884421717.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_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 17388 bytes
SHA-256: 8b0c230f7cbe52a5a08c4124854b13133eefea97989492c14224332e3db756ba
font_01_sfnt_off00011337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 10772 bytes
SHA-256: 9a8ab1799561e4eeb874da920d29c5dc11b8a80ae4fe3734f39d72bc5cf44bb9
font_02_sfnt_off00012bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1