Malicious PDF — malware analysis report

Static analysis result for SHA-256 a871070ef24b9437…

MALICIOUS

PDF

69.9 KB Created: 2021-09-02 13:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 857194a6901a1f73d3639a838be6f2d4 SHA-1: 10016e327937f2550578b3bb181cca6212815541 SHA-256: a871070ef24b943751fd829ef113d152442e2f2387498a262731df950e846fb2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, highlighting the use of non-clustered link farms on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/572832a1118170a22f924bf575f1016c/dajejita.pdf In PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/3330bc71b3ddfca64839f59c0bf1bf74/75764585678.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9f543dae6---vavusip.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/gufutiritiwazulebi.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210822104501.pdfIn PDF document text
    • http://haai.org/upload/file/25096872711.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/kaletolubobawapudovilak.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/bazogud.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b00248750e0---52016745491.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/92938997049.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073a1e71e8f0---tozovapiwizux.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/29958808711.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/25547908344.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/10596230885.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/2551432700.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62bb43d0f6---lalepoxilobukogubufanilon.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4ab7d0b463a7d06f3a6fa0c00200d0d5/5120101114.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/69345041786.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/79662e7680159bf8f10c1ea2348c8a11/74654872922.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/sewamegiduxuxupijododu.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4c310fabe---31304541473.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b42cb7ea5d3---89445481747.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081ec2e9ab7c---49562785908.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6e54c31191baea98d84990b167317803/bepasofobotafoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ketogenic+diet+definition+pdfPDF 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_off0000b414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB414 10308 bytes
SHA-256: 6130ec7fc5c3d18067f15f3adf1fee94ff208da2530720fe5c6b92f31712f244
font_01_sfnt_off0000cb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 15508 bytes
SHA-256: 397ba4b138be5a5b1b6e4623ba145b0512bbd9f512b90bb5d2cc0b51c7f72fac

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