Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2437cab1b9480d0…

MALICIOUS

PDF

108.7 KB Created: 2021-07-18 01:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4271e40dffe6b87df169caeaa4dd8b71 SHA-1: 8bf4124f8029d28290d9cf299cdc97856cdb136e SHA-256: a2437cab1b9480d0ab6a0510648c52b0fac14e1313dd0f2d323b63c9ebd096b2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/sepovox.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/10lqjb6ogr7v5igrnapvk7ddk0/gegifobosetivekawanepeg.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/51173400043.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kf0f5rt332iltm5a0fgtbrf8n2/84549608721.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/43468316063.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef68de3408---worutofaxuv.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/61374670999.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2ea88a454---vefitajijezu.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/wevinodilivux.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baedc49b3d---natoluji.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ts65grqplga3bh78mvo0herj5b/xewobijezuzirizikimev.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/pokozidebulexazisogewavo.pdfIn PDF document text
    • http://uci.ir/userfiles/file/39466756091.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/fufovu.pdfIn PDF document text
    • http://ccshecea.org/upload/files/wulatawonorako.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/3681409137.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3e3ef526eac8ebf8f6418f382e1f359a/77370945823.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ef4786b0f2fc6fda107a8f11a16af354/66889459171.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bac8e50c8f9---70380636876.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/powaterudupetakiwofob.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a5021d15ac11cdb87f223b8c087bf1b2/zivozatisimerijeziko.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ed3542b9be360d1e7b24dcc6df581f8/vukirinutupamimaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=6.4+1.3+packet+tracer+answersPDF 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_off00014171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15983 19880 bytes
SHA-256: 0a44a2be53201ac427b433e67349565570b670bb25a0b21fab9ac331c7d850f8
font_02_sfnt_off00018ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CCF 10724 bytes
SHA-256: 38124b341f304b19ff82bc447c1bb9b6e67d80bee9130b67356b30d6fdda199c

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