Malicious PDF — malware analysis report

Static analysis result for SHA-256 8674b795996bf534…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 13:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 902d6f59353c59ee0db659b114720593 SHA-1: 80ab3b378c175693d8db9296803dae11c9b13ee8 SHA-256: 8674b795996bf53448e25ffd40658418fe8a8457952860c193c7c1f34ebf4e58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://footstepfloor.com/upfiles/files/feruvakafejapalizex.pdf In PDF document text
    • http://lmnn.ru/userfiles/file/sarawitubiloroxekasi.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/dc35bf164fa7c9c207ddd9e2a88e215a/252511858.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/rifikiloz.pdfIn PDF document text
    • http://showpelec.com/data/file/20210904_175554_208.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/86626203097.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109022329042192.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/5332275412.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/75833113376.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/jerafexaj.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc482b3819---12640815271.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/73303728308.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/namurefa.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/bolevejugubagij.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131145733735---kipekitomosop.pdfIn PDF document text
    • http://venkateshservices.com/uploads/94039052224.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091322172852.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/f1cjiv8fkh3j97cq53tan470j6/83625587350.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/73248611183.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/mupefulejo.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/jakuverubuvuveduzeke.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/zejebogidajilufajenob.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/zuzokoroteropodojox.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/61444194817.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/wazujozuwojunud.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161406a513a62d---80649352235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=life+hacks+for+minecraftPDF 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_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 18224 bytes
SHA-256: 0980eb1fc420c6ce6d792ebc81c0abb08356a7c4df03cf2c9d1df46f61e1dc67
font_01_sfnt_off00010d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12520 10604 bytes
SHA-256: d21a5df8fcf0d1032410fe6552ead8a1697936f3c749904ba3980887c0efe2a2

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