Malicious PDF — malware analysis report

Static analysis result for SHA-256 a670e5ecbfa20b79…

MALICIOUS

PDF

92.6 KB Created: 2021-09-01 18:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 55eb7de0db600c5fec5199c72c1ba811 SHA-1: 67e310c818ffe0538ad11d3ea87739a489177d11 SHA-256: a670e5ecbfa20b79dd463dea2a4ca048ea1e01340139eb9ca79f9e995d5826b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9393c7caf---mimurimiwelapozemete.pdf In PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/b93639839ad5eafc6779c971462a6e27/doxejagexuruvarazaj.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/vgk3dfgve5k8ppr8po4qchkmj4/54242568992.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609896431d061---12090595567.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d9cdf6fbabe69255f2fde1738221d1ab/32223657876.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/69761537313.pdfIn PDF document text
    • http://jonme.net/ckupload/files/44510778446.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/260fbc7e90d217b599cb1b30cdb46f0f/mopirolemotejinoxuge.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160834382ba9e5---tebafesitenukamigulava.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/zimezib.pdfIn PDF document text
    • https://davnosti.ru/upload/5310628119.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/694216c241b4b302aad3afa015046fba/tudunetapirivagidol.pdfIn PDF document text
    • http://www.pvvc.cz/files/ruwuxuxulowikirof.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/4qk0tcl5ipi3k9btokrvte0674/10191966341.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202181629346681.pdfIn PDF document text
    • http://sns.hu/_user/file/ritim.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/30511272664.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/45406950786.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/40961314587.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac9d51ee89---lewuxavuboxive.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/jugarowukokavurukapadenov.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607317714f584---waguk.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/motijufafavanusiguxavamu.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e19ad7f9df49dd06e27e6eb6281551c7/jekilotavimusekokibevebok.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e199ea71a4a---83285659605.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d48c86db5---gagewom.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/tukinoroto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=different+types+of+hspPDF 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_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 10364 bytes
SHA-256: a4379cc039b576a816644cd8a9c2747e798e902d7e704d9be870711d25028d6c
font_02_sfnt_off0001341b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341B 18460 bytes
SHA-256: 0779ecbd98fa879ea4f67520d186529a34c1ecc2eacb9511d220df6889538119