Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f1a13ff94f6533…

MALICIOUS

PDF

99.7 KB Created: 2021-07-21 18:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d28de6e247ee9354cac3b4399d33c432 SHA-1: 838c13fb3910f2bafc6a1d6a4f730233e18fa5af SHA-256: c7f1a13ff94f65335da4b4e472373b065373a9a6a457d10d38ea676fcec4f95c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal being to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://247christianity.org/fckeditor/userfiles/file/635455132941625417114.pdf
    • https://www.dars.bg/ckfinder/userfiles/files/18946135697.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8116b21d8d1e5c0ce32dfc577a7905cc/logob.pdf
    • http://7tec.ru/userfiles/files/47747936335.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b8941930d---foguvifibotitasizoku.pdf
    • http://www.lnk-creation.fr/upload/file/13171394629.pdf
    • https://adikketiga.com/contents//files/pisapolesuzixutasev.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa9d62c88---22276750099.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac86b5631---nituku.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f44fc02cb6a---80026238885.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/mueng6h45umkvpmlhj8sbt3ad3/76347764047.pdf
    • https://atasuorganiktarim.com/upload/ckfinder/files/69455976522.pdf
    • http://polyacer-ecp.com/userfiles/files/20210706_051426.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082b82920dcd---rovikina.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094276e762c5---86558952551.pdf
    • http://palyavalaszto.hu/teszt/upload/file/duduzodarirawufade.pdf
    • https://istocdukkan.com/userfiles/files/99848779572.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4412976c184e29381d57f6f4b027d72f/feponegafavepixotaxovo.pdf
    • https://stmarys-perthamboy.com/upload/File/67637032146.pdf
    • http://globeksa.com/ckfinder/userfiles/files/vutoxaresir.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c28a4bf1a90cdb687feb6254e3a328b3/wugabonutukekutuxerixa.pdf
    • https://luyenthitoeic.info/userfiles/file/98111058963.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23f9b8651---lugarezozunef.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/65191a3aa87ce41614071de1523c368b/49366678685.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=printable+world+map+with+countries+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121fa.bin
92a270a4f746bb610382dbfc9a2d29ceebe42d89e706778daac3a3cdf715eab3
pdf-font-stream PDF embedded font (sfnt) at offset 0x121FA 17088 bytes
font_01_sfnt_off00014ead.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAD 16792 bytes
font_02_sfnt_off000166c4.bin
082bd292ac482c32dc7eafff41f57407a04deda116160378b5301f84e37f8ed9
pdf-font-stream PDF embedded font (sfnt) at offset 0x166C4 11212 bytes